fix lsp dsp lib on gnu/linux

Makefile

@@ -313,8 +313,9 @@ endef
 define make_lsp_dsp_lib
 	cd $(BUILD_DIR) && tar xf $(LSP_DSP_LIB_TARBALL) && \
 		cd lsp-dsp-lib-$(LSP_DSP_LIB_TAG) && \
-		make config PREFIX=/usr LIBDIR=$(2) || true
-	cd $(BUILD_DIR)/lsp-dsp-lib-$(LSP_DSP_LIB_TAG) && make fetch && make && $(1) make install
+		find . -type f -exec sed -i -e 's|$$(MAKEFLAGS)||g' {} \; \
+		make config PREFIX=/usr LIBDIR=$(2) && \
+		make fetch && make && $(1) make install
 endef
 
 # 1: distro name