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libmpeg2: fix PPC regression

Lyndon Brown requested to merge jnqnfe/vlc:mpeg2_reg into master

00d1f50e introduced a regression for PPC since the signal() based detection for altivec in libmpeg2 is not thread safe unlike our own. here we restore use of our own detection for PPC, bypassing libmpeg2's unsafe auto-detection otherwise triggered in mpeg2_init().

fixes #25948 (closed).

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