libgl-xlib: Fix --enable-gallium-llvm build.

Check MESA_LLVM and link to LLVM as other targets do.

src/gallium/targets/libgl-xlib/Makefile

@@ -51,6 +51,14 @@ LIBS = \
 	$(CELL_SPU_LIB) \
 
 
+# LLVM
+ifeq ($(MESA_LLVM),1)
+DEFINES += -DGALLIUM_LLVMPIPE
+GL_LIB_DEPS += $(LLVM_LIBS) 
+LDFLAGS += $(LLVM_LDFLAGS)
+endif
+
+
 .SUFFIXES : .cpp
 
 .c.o:
@@ -69,7 +77,7 @@ $(TOP)/$(LIB_DIR)/gallium:
 # Make the libGL.so library
 $(TOP)/$(LIB_DIR)/gallium/$(GL_LIB_NAME): $(XLIB_TARGET_OBJECTS) $(LIBS) Makefile
 	$(TOP)/bin/mklib -o $(GL_LIB) \
-		-linker "$(CXX)" \
+		-linker "$(CXX)" -ldflags '$(LDFLAGS)' \
 		-major $(GL_MAJOR) -minor $(GL_MINOR) -patch $(GL_TINY) \
 		-cplusplus \
 		-install $(TOP)/$(LIB_DIR)/gallium \