luasec: cleanup Makefile

The LIBDIR and INCDIR assignments are duplicate of the original
Makefile, changing LIB_PATH and INC_PATH to LDFLAGS and CPPFLAGS.

Setting LIB_PATH and INC_PATH to empty strings will do the same
without duplicating the flags.

Signed-off-by: Eneas U de Queiroz <cote2004-github@yahoo.com>

lang/luasec/Makefile

@@ -46,8 +46,8 @@ TARGET_LDFLAGS += $(FPIC)
 
 MAKE_FLAGS += \
 	LD="$(TARGET_CC)" \
-	INCDIR="$(TARGET_CPPFLAGS) -I." \
-	LIBDIR="$(TARGET_LDFLAGS) -L./luasocket" \
+	INC_PATH="" \
+	LIB_PATH="" \
 	LUACPATH="$(PKG_INSTALL_DIR)/usr/lib/lua" \
 	LUAPATH="$(PKG_INSTALL_DIR)/usr/lib/lua"