kmssink: Enable in meson build

sys/kms/meson.build

@@ -0,0 +1,21 @@
+kmssink_sources = [
+  'gstkmsallocator.c',
+  'gstkmsbufferpool.c',
+  'gstkmssink.c',
+  'gstkmsutils.c',
+]
+
+libdrm_dep = dependency('libdrm', version : '>= 2.4.55', required : false)
+libkms_dep = dependency('libkms', required : false)
+
+if libdrm_dep.found() and libkms_dep.found()
+  gstkmssink = library('gstkms',
+    kmssink_sources,
+    c_args : gst_plugins_bad_args,
+    include_directories : [configinc],
+    dependencies : [gstbase_dep, gstvideo_dep, gstallocators_dep, libdrm_dep,
+                    libkms_dep],
+    install : true,
+    install_dir : plugins_install_dir,
+  )
+endif

sys/meson.build

@@ -15,6 +15,7 @@ subdir('directsound')
 subdir('dvb')
 #subdir('dxr3')
 #subdir('fbdev')
+subdir('kms')
 #subdir('linsys')
 subdir('msdk')
 #subdir('nvenc')