goldfish-opengl: meson modifications for header change

Need to modify meson since virtgpu header location changed.

BUG=202552093
TEST=compile

Change-Id: I0c2125b2ea18716ac6e3a76f746f080220bd01fb
diff --git a/meson.build b/meson.build
index 3fc0928..19cc4ac 100644
--- a/meson.build
+++ b/meson.build
@@ -51,6 +51,7 @@
 
 inc_android_emu = include_directories('android-emu')
 inc_host = include_directories('host/include/libOpenglRender')
+inc_system = include_directories('system/include')
 
 #================#
 # Subdirectories #