[x265] cmake: avoid different stack alignment for GCC in 32-bit Windows

[Mateusz]

There are bugs in GCC 6.1 that prevent to compile working 32-bitx265for Windows(on default options).
This patch adds '-msse' option to default 32-bit build option to avoid different stack alignment.

# HG changeset patch
# User Ma0 <mateuszb at poczta.onet.pl>
# Date 1469540439 -7200
#      Tue Jul 26 15:40:39 2016 +0200
# Node ID b95ee119b5c6ccac4892c430c494d1a5f22b2ce0
# Parent  5a0e139e29386ecebafc9c555aedcd3e0f61c70c
cmake: avoid different stack alignment for GCC in 32-bit Windows

diff -r 5a0e139e2938 -r b95ee119b5c6 source/CMakeLists.txt
--- a/source/CMakeLists.txt    Fri Jul 22 13:13:42 2016 +0530
+++ b/source/CMakeLists.txt    Tue Jul 26 15:40:39 2016 +0200
@@ -184,6 +184,9 @@
         string(FIND "${CMAKE_CXX_FLAGS}" "-march" marchPos)
         if(marchPos LESS "0")
             add_definitions(-march=i686)
+            if(WIN32 AND NOT INTEL_CXX)
+                add_definitions(-msse)
+            endif()
         endif()
     endif()
     if(ARM AND CROSS_COMPILE_ARM)

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