Bug 1043108: Remove -arch:IA32 from non-x86 builds. r=dmajor.

Author: wantehchang

configure.in

@@ -1988,12 +1988,6 @@ tools are selected during the Xcode/Developer Tools installation.])
         PROFILE_USE_CFLAGS="-GL -wd4624 -wd4952"
         PROFILE_USE_LDFLAGS="-LTCG:PGUPDATE"
 
-        if test "$MSC_VER" -ge "1700"; then
-            dnl Visual C++ 2012 defaults to -arch:SSE2. Use -arch:IA32 to
-            dnl avoid requiring SSE2.
-            CFLAGS="$CFLAGS -arch:IA32"
-        fi
-
         if test "$MSC_VER" -ge "1800"; then
             dnl Visual C++ 2013 requires -FS when parallel building with
             dnl make -jN. If not specified, compiler sometimes emits C1041
@@ -2087,6 +2081,11 @@ tools are selected during the Xcode/Developer Tools installation.])
 	    AC_DEFINE(_AMD64_)
 	else		
 	    AC_DEFINE(_X86_)
+            if test -z "$GNU_CC" -a "$MSC_VER" -ge "1700"; then
+                dnl Visual C++ 2012 defaults to -arch:SSE2. Use -arch:IA32
+                dnl to avoid requiring SSE2.
+                CFLAGS="$CFLAGS -arch:IA32"
+            fi
 	fi
         ;;
     x86_64)