meson: move wayland-egl into egl folder

This ensure that it's properly guarded, but also makes the code clearer
by grouping related things together.

Signed-off-by: Dylan Baker <dylanx.c.baker@intel.com>
Reviewed-by: Eric Anholt <eric@anholt.net>

src/egl/meson.build

@@ -182,6 +182,10 @@ pkg.generate(
   extra_cflags : gl_pkgconfig_c_flags,
 )
 
+if with_platform_wayland
+  subdir('wayland/wayland-egl')
+endif
+
 if with_tests
   if with_glvnd
     # TODO: add glvnd symbol check

src/meson.build

@@ -59,9 +59,6 @@ subdir('intel')
 subdir('mesa')
 subdir('loader')
 subdir('glx')
-if with_platform_wayland
-  subdir('egl/wayland/wayland-egl')
-endif
 if with_gbm
   subdir('gbm')
 endif