mesa: Remove no longer needed patch

* Commited upstream to Mesa in:
  http://cgit.freedesktop.org/mesa/mesa/commit/?id=cb3054c849d84

3rdparty/mesa/Mesa-8.1devel-archfix.diff

@@ -1,27 +0,0 @@
-diff --git a/scons/gallium.py b/scons/gallium.py
-index 2fa80db..b99e753 100755
---- a/scons/gallium.py
-+++ b/scons/gallium.py
-@@ -327,7 +327,7 @@ def generate(env):
-                 #'-march=pentium4',
-             ]
-             if distutils.version.LooseVersion(ccversion) >= distutils.version.LooseVersion('4.2') \
--               and (platform != 'windows' or env['build'] == 'debug' or True):
-+               and platform not in ['windows', 'haiku']:
-                 # NOTE: We need to ensure stack is realigned given that we
-                 # produce shared objects, and have no control over the stack
-                 # alignment policy of the application. Therefore we need
-@@ -343,6 +343,13 @@ def generate(env):
-                     '-mmmx', '-msse', '-msse2', # enable SIMD intrinsics
-                     #'-mfpmath=sse',
-                 ]
-+            if platform in ['haiku']:
-+                ccflags += [
-+                    '-mstackrealign', # ensure stack is aligned
-+                    '-march=i586', # Haiku target is Pentium
-+                    '-mtune=i686', # Use i686 where we can
-+                    '-mmmx', # Use mmx math where we can
-+                ]
-             if platform in ['windows', 'darwin']:
-                 # Workaround http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37216
-                 ccflags += ['-fno-common']