avfvideosrc: Fix missing GLMemory support.

GLMemory support is missing when doing desktop capture, which is
unexpected when inspecting the plugin.

This adds caps for GLMemory for UYVY for screen capture (which is already in
place for video capture).
25 jobs for avfvideosrc-add-glmem-for-screencap in 89 minutes and 32 seconds (queued for 13 seconds)
latest
Status Job ID Name Coverage
  Preparation
passed #874927
gst indent

00:00:40

passed #874926
manifest

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  Build
passed #874937
build cerbero cross-android universal

00:11:31

manual #874941
gst-ios-12.2 allowed to fail manual
build cerbero cross-ios universal
passed #874938
build cerbero cross win32

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passed #874939
build cerbero cross win64

00:05:35

passed #874936
build cerbero fedora x86_64

00:07:48

passed #874940
gst-macos-10.14
build cerbero macos x86_64

00:06:18

passed #874932
build clang fedora x86_64

00:09:24

passed #874928
build fedora x86_64

00:04:55

passed #879081
docker windows 1607
build msys2

00:16:21

passed #874929
build nodebug fedora x86_64

00:06:50

passed #874930
build static fedora x86_64

00:17:02

passed #874931
build static nodebug fedora x86_64

00:06:40

passed #879082
docker windows 1607
build vs2017 amd64

00:14:09

passed #879083
docker windows 1607
build vs2017 x86

00:15:29

failed #874935
docker windows 1607
build msys2

failed #874933
docker windows 1607
build vs2017 amd64

failed #874934
docker windows 1607
build vs2017 x86

 
  Test
passed #874942
check fedora

00:03:36

passed #874943
integration testsuites fedora

00:39:05

passed #874944
valgrind bad

00:06:39

 
  Integrate
passed #874945
cross-android universal examples

00:08:44

manual #874947
gst-ios-12.2 allowed to fail manual
cross-ios universal examples
passed #874946
documentation

00:03:48