targets/libgl-gdi: link with mesautil

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>

src/gallium/targets/libgl-gdi/SConscript

@@ -6,6 +6,7 @@ Import('*')
 env = env.Clone()
 
 env.Append(CPPPATH = [
+    '#src',
     '#src/gallium/state_trackers/wgl',
     '#src/gallium/winsys/sw',
 ])
@@ -17,6 +18,8 @@ env.Append(LIBS = [
     'ws2_32',
 ])
 
+env.Prepend(LIBS = [mesautil])
+
 sources = ['libgl_gdi.c']
 drivers = []