MFH: r465972

www/waterfox: unbreak on aarch64 after r465246

../../media/libwebp/dsp/yuv.o: In function `WebPInitConvertARGBToYUV':
media/libwebp/dsp/yuv.c:(.text.WebPInitConvertARGBToYUV+0x78): undefined reference to `WebPInitConvertARGBToYUVNEON'
media/libwebp/dsp/yuv.c:(.text.WebPInitConvertARGBToYUV+0x7c): undefined reference to `WebPInitSharpYUVNEON'
/usr/local/bin/ld.bfd: libxul.so: hidden symbol `WebPInitConvertARGBToYUVNEON' isn't defined
/usr/local/bin/ld.bfd: final link failed: Bad value
c++: error: linker command failed with exit code 1 (use -v to see invocation)

Reported by: pkg-fallout
Approved by: ports-secteam blanket