cmake: do not use -fPIC on 32 bit x86, breaks asm

Do not add the -fPIC (position independent code) compiler flag on 32 bit
x86 architectures because that breaks inline assembly, and some included
libraries like fex require inline assembly to work.

Signed-off-by: Rafael Kitover <rkitover@gmail.com>

CMakeLists.txt

@@ -417,7 +417,7 @@ if(CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID STREQUAL Clang)
     # common flags
     set(MY_C_FLAGS -pipe -Wformat -Wformat-security -D_FORTIFY_SOURCE=2 -feliminate-unused-debug-types)
 
-    if(NOT WIN32)
+    if(NOT (WIN32 OR X86_32)) # inline asm is not allowed with -fPIC
         set(MY_C_FLAGS ${MY_C_FLAGS} -fPIC)
     endif()