Extend __mulodi4() hack to 32-bit x86.

gyp/dng_sdk.gyp

Index: gyp/dng_sdk.gyp
diff --git a/gyp/dng_sdk.gyp b/gyp/dng_sdk.gyp
index be0c0f97db1673566d2eb3ef85a88863d093debd..05d6c25222bad2ca390d5ff7e1a8910c977702be 100644
--- a/gyp/dng_sdk.gyp
+++ b/gyp/dng_sdk.gyp
@@ -143,9 +143,9 @@
     ['skia_os != "linux"', {
       'sources': ['<@(headers)'],
     }],
-    ['skia_arch_type == "arm" and skia_clang_build', {
+    ['(skia_arch_type == "arm" or skia_arch_type == "x86") and skia_clang_build', {
       # DNG SDK uses __builtin_smulll_overflow() to detect 64x64 bit multiply overflow.
-      # On ARMv7, Clang implements this with __mulodi4() in libclang_rt.
+      # On ARMv7 and 32-bit x86, Clang implements this with __mulodi4() in libclang_rt.
       # I can't quite figure out how to link that here, so instead here's a shim for
       # __builtin_smulll_overflow() that multiplies normally assuming no overflow.
       # Tracked in b/29412086.