add android armv7a ffmpeg libraries

[SiminBadri]

Currently, only windows ffmpeg libraries are included in wolf. To support android version, android ffmpeg built libraries are also needed to be added to wolf.

Architectures to be supported:

• armv7-a
• armv8-a

The following features should be enable (i.e. related libraries should be included into the final ffmpeg libraries):

• x264
• x265
• svt-av1
• dav1d
• vpx

armv8-a architecture libraries could be added later under another issue.