Bug 1486056 - don't compile SkJumper_generated_win.S on aarch64 windows; r=lsalzman

Compiling a blob of x86 machine code is not going to end well.

gfx/skia/generate_mozbuild.py

@@ -456,7 +456,7 @@ def write_mozbuild(sources):
   write_sources(f, sources['linux'], 4)
 
   f.write("if CONFIG['MOZ_WIDGET_TOOLKIT'] == 'windows':\n")
-  f.write("    if CONFIG['CC_TYPE'] not in ('gcc', 'clang'):\n")
+  f.write("    if CONFIG['CC_TYPE'] not in ('gcc', 'clang') and CONFIG['CPU_ARCH'] != 'aarch64':\n")
   write_list(f, "SOURCES", sources['no-mingw'], 8)
   # Windows-specific files don't get unification because of nasty headers.
   # Luckily there are not many files in this.

gfx/skia/moz.build

@@ -626,7 +626,7 @@ if CONFIG['MOZ_WIDGET_TOOLKIT'] == 'gtk3':
         'skia/src/ports/SkFontHost_FreeType_common.cpp',
     ]
 if CONFIG['MOZ_WIDGET_TOOLKIT'] == 'windows':
-    if CONFIG['CC_TYPE'] not in ('gcc', 'clang'):
+    if CONFIG['CC_TYPE'] not in ('gcc', 'clang') and CONFIG['CPU_ARCH'] != 'aarch64':
         SOURCES += [
             'skia/src/jumper/SkJumper_generated_win.S',
         ]