meson: fix egl build for android

Haven't tested this, but we do include loader.h
in platform_android.c

Fixes: c5ec155685 ("meson: wire up egl/android")
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>

src/egl/meson.build

@@ -130,6 +130,7 @@ endif
 if with_platform_android
   deps_for_egl += dep_android
   files_egl += files('drivers/dri2/platform_android.c')
+  incs_for_egl += [inc_loader]
 endif
 if with_platform_haiku
   incs_for_egl += inc_haikugl