x11/libXvMC: Update to 1.0.11

Update x11/libXvMC to 1.0.11
This release contains some minor fixes, and updates to the build system.

add INSTALL_TARGET=install-strip to strip binaries and libraries

Changelog:
https://lists.x.org/archives/xorg-announce/2019-March/002981.html

Sponsored by: B3 Init