Make x32 compile with gcc.

BUG=chromium:430032
LOG=n

Review URL: https://codereview.chromium.org/1156183004

Cr-Commit-Position: refs/heads/master@{#28821}

build/standalone.gypi

@@ -175,7 +175,7 @@
         'v8_enable_gdbjit%': 0,
       }],
       ['(OS=="linux" or OS=="mac") and (target_arch=="ia32" or target_arch=="x64") and \
-        (v8_target_arch!="x87")', {
+        (v8_target_arch!="x87" and v8_target_arch!="x32")', {
         'clang%': 1,
       }, {
         'clang%': 0,