build: introduce default build variables (#21991)

There are a number of cmake variables and cache variables that need to
be passed to all dependencies. This is not only cumbersome, but also
fragile as it's easy to miss adding or removing a flag from a dependency
by accident. Introducing a global variable that controls all builds
makes it much easier to handle our dependencies.

Also fixes the currently broken release workflow as we need to pass the
CMAKE_OSX_ARCHITECTURES variable to all dependencies built with cmake.

cmake.deps/cmake/BuildMsgpack.cmake

@@ -1,13 +1,3 @@
-set(MSGPACK_CMAKE_ARGS
-    -DMSGPACK_BUILD_TESTS=OFF
-    -DMSGPACK_BUILD_EXAMPLES=OFF
-    -DCMAKE_INSTALL_PREFIX=${DEPS_INSTALL_DIR}
-    -DCMAKE_C_COMPILER=${CMAKE_C_COMPILER}
-    -DCMAKE_GENERATOR=${CMAKE_GENERATOR}
-    -DCMAKE_GENERATOR_PLATFORM=${CMAKE_GENERATOR_PLATFORM}
-    -DCMAKE_POSITION_INDEPENDENT_CODE=ON
-    ${BUILD_TYPE_STRING})
-
 if(USE_EXISTING_SRC_DIR)
   unset(MSGPACK_URL)
 endif()
@@ -16,8 +6,9 @@ ExternalProject_Add(msgpack
   URL_HASH SHA256=${MSGPACK_SHA256}
   DOWNLOAD_NO_PROGRESS TRUE
   DOWNLOAD_DIR ${DEPS_DOWNLOAD_DIR}/msgpack
-  CMAKE_ARGS "${MSGPACK_CMAKE_ARGS}"
-  CMAKE_CACHE_ARGS
-    -DCMAKE_OSX_ARCHITECTURES:STRING=${CMAKE_OSX_ARCHITECTURES})
+  CMAKE_ARGS ${DEPS_CMAKE_ARGS}
+    -DMSGPACK_BUILD_TESTS=OFF
+    -DMSGPACK_BUILD_EXAMPLES=OFF
+  CMAKE_CACHE_ARGS ${DEPS_CMAKE_CACHE_ARGS})
 
 list(APPEND THIRD_PARTY_DEPS msgpack)