CMake: Add find module for BlocksRuntime on non-Apple platforms

Author: https://github.com/ADKaster
Commit: 72acb1111f
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/3963
Reviewed-by: https://github.com/alimpfard
Reviewed-by: https://github.com/bugaevc

Meta/CMake/FindBlocksRuntime.cmake

@@ -0,0 +1,19 @@
+# Finds the BlocksRuntime library
+# On Apple platforms, this does not exist and is folded into other System libraries
+
+find_library(BLOCKS_RUNTIME NAMES BlocksRuntime
+    PATHS ${SWIFT_LIBRARY_SEARCH_PATHS}
+)
+if (BLOCKS_RUNTIME)
+    if (NOT TARGET BlocksRuntime::BlocksRuntime)
+        add_library(BlocksRuntime::BlocksRuntime IMPORTED UNKNOWN)
+        message(STATUS "Found BlocksRuntime: ${BLOCKS_RUNTIME}")
+        cmake_path(GET BLOCKS_RUNTIME PARENT_PATH _BLOCKS_RUNTIME_DIR)
+        set_target_properties(BlocksRuntime::BlocksRuntime PROPERTIES
+                IMPORTED_LOCATION "${BLOCKS_RUNTIME}"
+                INTERFACE_LINK_DIRECTORIES "${_BLOCKS_RUNTIME_DIR}"
+                INTERFACE_COMPILE_OPTIONS "$<$<COMPILE_LANGUAGE:C,CXX>:-fblocks>;SHELL:$<$<COMPILE_LANGUAGE:Swift>:-Xcc -fblocks>"
+        )
+    endif()
+    set(BlocksRuntime_FOUND TRUE)
+endif()