multiple: Fix msgpack cmake package name

msgpack-c's cmake package name changed to `msgpackc'
msgpack-cxx's cmake package named to `msgpackc-cxx' because I guess
that's how msgpack's developers roll.

Fix the two instances I could find where a CMakeLists.txt was looking
for msgpack through its cmake package name. There are probably others.

devel/opendht/files/patch-CMakeLists.txt

@@ -1,5 +1,14 @@
---- CMakeLists.txt.orig	2022-11-06 06:47:13 UTC
+--- CMakeLists.txt.orig	2023-01-10 16:45:50 UTC
 +++ CMakeLists.txt
+@@ -61,7 +61,7 @@ if (NOT MSVC)
+     pkg_search_module (Nettle REQUIRED nettle)
+     check_include_file_cxx(msgpack.hpp HAVE_MSGPACKCXX)
+     if (NOT HAVE_MSGPACKCXX)
+-        find_package (msgpack REQUIRED)
++        find_package (msgpackc-cxx REQUIRED)
+     endif()
+     if (OPENDHT_TOOLS)
+         find_package (Readline 6 REQUIRED)
 @@ -91,8 +91,8 @@ if (NOT MSVC)
          endif()
          if (OPENDHT_PROXY_OPENSSL)

science/mmtf-cpp/Makefile

@@ -30,6 +30,8 @@ post-patch: # correct paths of test data to be accessible to the test executable
 		s|\.\./submodules/mmtf_spec|${WRKSRC}/submodules/mmtf_spec|g; \
 		s|\.\./temporary_test_data|${WRKSRC}/temporary_test_data|g' \
 		${WRKSRC}/tests/mmtf_tests.cpp
+	@${REINPLACE_CMD} -e '/find_package/s|msgpack|msgpackc-cxx|' \
+		${WRKSRC}/CMakeLists.txt
 
 do-install:
 	cd ${WRKSRC} && ${COPYTREE_SHARE} include ${STAGEDIR}${PREFIX}