message: build: Disable libbsd when building zeromq package in depends
  Since v4.3.3 (068385c951c0608edec6264d55ba9c4c923acccc) libbsd is used
  by default. As we have no libbsd package in our depends, disable it
  explicitly. Zeromq will fallback to its internal strlcpy implementation.
diff: @@ -6,7 +6,8 @@ $(package)_sha256_hash=c593001a89f5a85dd2ddf564805deb860e02471171b3f204944857336
  $(package)_patches=remove_libstd_link.patch netbsd_kevent_void.patch
  define $(package)_set_vars
  - $(package)_config_opts=--without-docs --disable-shared --disable-curve --disable-curve-keygen --disable-perf
  + $(package)_config_opts = --without-docs --disable-shared
  + $(package)_config_opts += --disable-perf --disable-curve-keygen --disable-curve --disable-libbsd
  $(package)_config_opts += --without-libsodium --without-libgssapi_krb5 --without-pgm --without-norm --without-vmci
  $(package)_config_opts += --disable-libunwind --disable-radix-tree --without-gcov --disable-dependency-tracking
  $(package)_config_opts += --disable-Werror --disable-drafts --enable-option-checking
  