[FFmpeg-devel] [PATCH] lavf/wavdec.c: Fix unresolved symbols on Mac and VS2015 Update 3

[Matthew Wolenetz]

Some toolchains failed to link a dynamic library containing wavdec.c,
but with either CONFIG_SPDIF_DEMUXER or CONFIG_W64_DEMUXER disabled.
This change adds #if's to explicitly exclude code rather than depend on
toolchain code elision of same condition using "if".
Reference https://crbug.com/591845. Adapted from 2 Chromium ffmpeg
patches for code style:
b281073a7b1ccff67b2cd8ec636facceeeb82327
5d76f94a515900260f185d5949f72ed6fa4bdd94
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