This reverts commit 4964bd75.

No idea what this fixes, for me it breaks make dist, which fails
with:

make[2]: Entering directory `/home/tpm/gst/0.11/gst-ffmpeg/gst-libs/ext'
GIT_DIR=libav/.git git checkout-index --prefix=../libav-dist/libav/ -a
touch libav-dist/libav/config.mak
touch: cannot touch `libav-dist/libav/config.mak': No such file or directory

after a clean build.