darwin: Don't link against libGL when building libOSMesa

Everything should be resolved through glapi.

Signed-off-by: Jeremy Huddleston <jeremyhu@apple.com>
diff --git a/configs/darwin b/configs/darwin
index 3cf1110..ff58014 100644
--- a/configs/darwin
+++ b/configs/darwin
@@ -47,7 +47,7 @@
 VG_LIB_GLOB = lib$(VG_LIB).*.dylib
 
 GL_LIB_DEPS = -L$(INSTALL_DIR)/$(LIB_DIR) -L$(X11_DIR)/$(LIB_DIR) -lX11 -lXext -lm -lpthread
-OSMESA_LIB_DEPS = -L$(TOP)/$(LIB_DIR) -l$(GL_LIB)
+OSMESA_LIB_DEPS =
 GLU_LIB_DEPS = -L$(TOP)/$(LIB_DIR) -l$(GL_LIB)
 GLUT_LIB_DEPS = -L$(TOP)/$(LIB_DIR) -l$(GLU_LIB) -l$(GL_LIB)  -L$(INSTALL_DIR)/$(LIB_DIR) -L$(X11_DIR)/$(LIB_DIR) -lX11 -lXmu -lXi -lXext
 GLW_LIB_DEPS = -L$(TOP)/$(LIB_DIR) -l$(GL_LIB) -L$(INSTALL_DIR)/$(LIB_DIR) -L$(X11_DIR)/$(LIB_DIR) -lX11 -lXt