switch the build system to waf

This commit adds a new build system based on waf. configure and Makefile
are deprecated effective immediately and someday in the future they will be
removed (they are still available by running ./old-configure).

You can find how the choice for waf came to be in `DOCS/waf-buildsystem.rst`.
TL;DR: we couldn't get the same level of abstraction and customization with
other build systems we tried (CMake and autotools).

For guidance on how to build the software now, take a look at README.md
and the cross compilation guide.

CREDITS:
This is a squash of ~250 commits. Some of them are not by me, so here is the
deserved attribution:

 - @wm4 contributed some Windows fixes, renamed configure to old-configure
   and contributed to the bootstrap script. Also, GNU/Linux testing.
 - @lachs0r contributed some Windows fixes and the bootstrap script.
 - @Nikoli contributed a lot of testing and discovered many bugs.
 - @CrimsonVoid contributed changes to the bootstrap script.

waftools/detections/compiler.py

@@ -0,0 +1,57 @@
+from waflib import Utils
+
+def __get_cc_env_vars__(cc):
+    cmd = cc + ['-dM', '-E', '-']
+    try:
+        p = Utils.subprocess.Popen(cmd, stdin=Utils.subprocess.PIPE,
+                                        stdout=Utils.subprocess.PIPE,
+                                        stderr=Utils.subprocess.PIPE)
+        p.stdin.write('\n'.encode())
+        return p.communicate()[0]
+    except Exception:
+        return ""
+
+def __add_generic_flags__(ctx):
+    ctx.env.CFLAGS += ["-D_ISOC99_SOURCE", "-D_GNU_SOURCE",
+                       "-D_LARGEFILE_SOURCE", "-D_FILE_OFFSET_BITS=64",
+                       "-D_LARGEFILE64_SOURCE",
+                       "-std=gnu99", "-Wall"]
+
+    if ctx.is_debug_build():
+        ctx.env.CFLAGS += ['-g']
+
+def __add_gcc_flags__(ctx):
+    ctx.env.CFLAGS += ["-Wundef", "-Wmissing-prototypes",
+                       "-Wno-switch", "-Wno-parentheses", "-Wpointer-arith",
+                       "-Wredundant-decls", "-Wno-pointer-sign",
+                       "-Werror=implicit-function-declaration",
+                       "-Wno-error=deprecated-declarations",
+                       "-Wno-error=unused-function" ]
+
+def __add_clang_flags__(ctx):
+    ctx.env.CFLAGS += ["-Wno-logical-op-parentheses", "-fcolor-diagnostics"]
+
+def __add_mingw_flags__(ctx):
+    ctx.env.CFLAGS += ['-D__USE_MINGW_ANSI_STDIO=1']
+    ctx.env.CFLAGS += ['-DBYTE_ORDER=1234']
+    ctx.env.CFLAGS += ['-DLITLE_ENDIAN=1234']
+    ctx.env.CFLAGS += ['-DBIG_ENDIAN=4321']
+    ctx.env.LAST_LINKFLAGS += ['-mconsole']
+
+__compiler_map__ = {
+    '__GNUC__':  __add_gcc_flags__,
+    '__clang__': __add_clang_flags__,
+    '__MINGW32__': __add_mingw_flags__,
+}
+
+def __apply_map__(ctx, fnmap):
+    if 'CC_ENV_VARS' not in ctx.env:
+        ctx.env.CC_ENV_VARS = str(__get_cc_env_vars__(ctx.env.CC))
+    for k, fn in fnmap.items():
+        if ctx.env.CC_ENV_VARS.find(k) > 0:
+            fn(ctx)
+
+def configure(ctx):
+    __add_generic_flags__(ctx)
+    __apply_map__(ctx, __compiler_map__)
+

waftools/detections/cpu.py

@@ -0,0 +1,28 @@
+def x86(ctx):
+    ctx.define('ARCH_X86', 1)
+    ctx.define('ARCH_X86_32', 1)
+
+def x86_64(ctx):
+    ctx.define('ARCH_X86', 1)
+    ctx.define('ARCH_X86_64', 1)
+    ctx.define('HAVE_FAST_64BIT', 1)
+
+def ia64(ctx):
+    ctx.define('HAVE_FAST_64BIT', 1)
+
+def default(ctx):
+    pass
+
+def configure(ctx):
+    ctx.define('ARCH_X86', 0)
+    ctx.define('ARCH_X86_32', 0)
+    ctx.define('ARCH_X86_64', 0)
+    ctx.define('HAVE_FAST_64BIT', 0)
+
+    ctx.define('HAVE_MMX',   'ARCH_X86', quote=False)
+    ctx.define('HAVE_MMX2',  'ARCH_X86', quote=False)
+    ctx.define('HAVE_SSE',   'ARCH_X86', quote=False)
+    ctx.define('HAVE_SSE2',  'ARCH_X86', quote=False)
+    ctx.define('HAVE_SSSE3', 'ARCH_X86', quote=False)
+
+    globals().get(ctx.env.DEST_CPU, default)(ctx)

waftools/detections/devices.py

@@ -0,0 +1,29 @@
+__cdrom_devices_map__ = {
+    'win32':   'D:',
+    'cygwin':  'D:',
+    'darwin':  '/dev/disk1',
+    'freebsd': '/dev/cd0',
+    'openbsd': '/dev/rcd0r',
+    'default': '/dev/cdrom'
+}
+
+__dvd_devices_map__ = {
+    'win32':   'D:',
+    'cygwin':  'D:',
+    'darwin':  '/dev/rdiskN',
+    'freebsd': '/dev/cd0',
+    'openbsd': '/dev/rcd0r',
+    'default': '/dev/dvd'
+}
+
+def __default_cdrom_device__(ctx):
+    default = __cdrom_devices_map__['default']
+    return __cdrom_devices_map__.get(ctx.env.DEST_OS, default)
+
+def __default_dvd_device__(ctx):
+    default = __dvd_devices_map__['default']
+    return __dvd_devices_map__.get(ctx.env.DEST_OS, default)
+
+def configure(ctx):
+    ctx.define('DEFAULT_DVD_DEVICE', __default_dvd_device__(ctx))
+    ctx.define('DEFAULT_CDROM_DEVICE', __default_cdrom_device__(ctx))