Fix 458+ffmpeg build #3
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Without this, when I was building ffmpeg and ffms2 shared, it was failing to build (note that if ffmpeg was shared and ffms2 static, it was working)
The file m4/ax_check_link_flag.m4 is a copy of https://www.gnu.org/software/autoconf-archive/ax_check_link_flag.html Fix FFMS#458
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The first commit allows building ffmpeg/ffms2 as static or shared libraries to test all possible combinations. Note that I removed
make test(the goal here is just to build ffms2).The second commit fixes the build when trying to link to libavutil on Ubuntu.
The third commit uses
AX_CHECK_LINK_FLAGinstead of trying to link to ffmpeg. This allows supporting*-uninstalled.pc.