build: use patch rather than sed in zeromq package

depends/packages/zeromq.mk

@@ -3,6 +3,7 @@ $(package)_version=4.3.1
 $(package)_download_path=https://github.com/zeromq/libzmq/releases/download/v$($(package)_version)/
 $(package)_file_name=$(package)-$($(package)_version).tar.gz
 $(package)_sha256_hash=bcbabe1e2c7d0eec4ed612e10b94b112dd5f06fcefa994a0c79a45d835cd21eb
+$(package)_patches=remove_libstd_link.patch
 
 define $(package)_set_vars
   $(package)_config_opts=--without-docs --disable-shared --disable-curve --disable-curve-keygen --disable-perf
@@ -15,7 +16,8 @@ define $(package)_set_vars
 endef
 
 define $(package)_preprocess_cmds
-   cp -f $(BASEDIR)/config.guess $(BASEDIR)/config.sub config
+  patch -p1 < $($(package)_patch_dir)/remove_libstd_link.patch && \
+  cp -f $(BASEDIR)/config.guess $(BASEDIR)/config.sub config
 endef
 
 define $(package)_config_cmds
@@ -31,6 +33,5 @@ define $(package)_stage_cmds
 endef
 
 define $(package)_postprocess_cmds
-  sed -i.old "s/ -lstdc++//" lib/pkgconfig/libzmq.pc && \
   rm -rf bin share lib/*.la
 endef