Bug#891062: chromium: skia fails to build on arm64

[Michael Gilbert]

package: src:chromium-browser
version: 65.0.3325.73-1
severity: serious

Starting with chromium 65, arm64 fails while building skia.

../../third_party/skia/src/jumper/SkJumper_stages.cpp: In function 'F
from_half(U16)':
../../third_party/skia/src/jumper/SkJumper_stages.cpp:670:12: error:
'vcvt_f32_f16' was not declared in this scope
     return vcvt_f32_f16(h);

Best wishes,
Mike