[pycrypto] compiling on AIX patch

[Brent S. Elmer Ph.D.]

When building on AIX using the xlc family of compilers, -std=c99 is not
valid.  Instead it should be -qlanglvl=stdc99.  Here is a patch to
setup.py to test and apply the change.

$ diff -u setup.py ../../pycrypto-2.6.1/setup.py
--- setup.py    2013-10-14 17:38:10.000000000 -0400
+++ ../../pycrypto-2.6.1/setup.py       2014-05-07 15:39:32.000000000
-0400
@@ -118,8 +118,12 @@
              self.__add_compiler_option("-std=c99")
  
              # ... but don't tell that to the aCC compiler on HP-UX
+             #     or the xlc compiler on AIX
              if self.compiler.compiler_so[0] == 'cc' and
sys.platform.startswith('hp-ux'):
                  self.__remove_compiler_option("-std=c99")
+             elif self.compiler.compiler_so[0].startswith('xlc') and
sys.platform.startswith('aix'): 
+                 self.__remove_compiler_option("-std=c99")
+                 self.__add_compiler_option("-qlanglvl=stdc99")
  
              # Make assert() statements always work
              self.__remove_compiler_option("-DNDEBUG")