Revert "avutil: Duplicate ff_log2_tab instead of sharing it across libs"

This reverts commit 930c9d4373e0f3cb7c64fcfc129127a309f6d066.

Signed-off-by: Lucky <lekatahanas@gmail.com>

Conflicts:
	libavcodec/Makefile
	libavutil/Makefile
	libavutil/mathematics.c