meson: only build clapi tests when OpenGL is being built

Otherwise building just vulkan (among other things) will build these
tests, pull in a bunch of stuff they shouldn't, and potentially fail to
compile.

Reviewed-by: Eric Engestrom <eric.engestrom@intel.com>

src/mapi/glapi/meson.build

@@ -78,7 +78,7 @@ libglapi_static = static_library(
   build_by_default : false,
 )
 
-if not with_shared_glapi and with_tests
+if with_any_opengl and not with_shared_glapi and with_tests
   test(
     'glapi_static_check_table',
     executable(

src/mapi/shared-glapi/meson.build

@@ -50,7 +50,7 @@ libglapi = shared_library(
   install : true,
 )
 
-if with_tests
+if with_any_opengl and with_tests
   test(
     'shared-glapi-test',
     executable(