depends: add zeromq mktemp macos patch

depends/patches/zeromq/macos_mktemp_check.patch

@@ -0,0 +1,16 @@
+build: fix mkdtemp check on macOS
+
+On macOS, mkdtemp is in unistd.h. Fix the CMake check so that is works.
+Upstreamed in https://github.com/zeromq/libzmq/pull/4668.
+
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -599,7 +599,7 @@ if(NOT MSVC)
+ 
+   check_cxx_symbol_exists(fork unistd.h HAVE_FORK)
+   check_cxx_symbol_exists(gethrtime sys/time.h HAVE_GETHRTIME)
+-  check_cxx_symbol_exists(mkdtemp stdlib.h HAVE_MKDTEMP)
++  check_cxx_symbol_exists(mkdtemp "stdlib.h;unistd.h" HAVE_MKDTEMP)
+   check_cxx_symbol_exists(accept4 sys/socket.h HAVE_ACCEPT4)
+   check_cxx_symbol_exists(strnlen string.h HAVE_STRNLEN)
+ else()