meson: fix pkg-config Gl Require.Private

xf86vm -> xxf86vm

Signed-off-by: Dylan Baker <dylanx.c.baker@intel.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>
diff --git a/meson.build b/meson.build
index 875f9d4..df7084c 100644
--- a/meson.build
+++ b/meson.build
@@ -823,7 +823,7 @@
   'xcb-glx >= 1.8.1', 'libdrm >= 2.4.75',
 ]
 if dep_xf86vm != [] and dep_xf86vm.found()
-  gl_priv_reqs += 'xf86vm'
+  gl_priv_reqs += 'xxf86vm'
 endif
 if with_dri_platform == 'drm'
   gl_priv_reqs += 'xcb-dri2 >= 1.8'