[cmake] Added support for ccache on Windows, dropped clcache.

- clache is not developed anymore
- ccache for windows is not yet in the main branch but here:
    https://github.com/cristianadam/ccache/releases
- Ninja and Release only!

CMakeLists.txt

@@ -71,7 +71,6 @@ include(ConanSetup)
 include(CompilerSetup)
 include(JobPools)
 include(Find)
-include(CLCacheSetup)
 include(packaging/PackagingDependencies)
 include(DependenciesExternalProject)
 include(Dependencies)

scripts/cmake/CLCacheSetup.cmake

-if(NOT WIN32 OR NOT CLCACHE_TOOL_PATH OR OGS_DISABLE_COMPILER_CACHE)
-    return()
-endif()
-
-file(DOWNLOAD
-    https://gitlab.com/timblechmann/clcache-launcher/uploads/c11842f963af3543b448cb400ed5fce9/clcache-launcher.exe
-    ${PROJECT_BINARY_DIR}/clcache-launcher.exe
-)
-
-set(CMAKE_C_COMPILER_LAUNCHER ${PROJECT_BINARY_DIR}/clcache-launcher.exe)
-set(CMAKE_CXX_COMPILER_LAUNCHER ${PROJECT_BINARY_DIR}/clcache-launcher.exe)
-
-message(STATUS "clcache enabled! (${CLCACHE_TOOL_PATH})")

scripts/cmake/Dependencies.cmake

 set(CMAKE_FOLDER ThirdParty)
 
-# ccache
+# ccache, on Windows requires https://github.com/cristianadam/ccache/releases
 if(NOT WIN32 AND CCACHE_TOOL_PATH AND NOT OGS_DISABLE_COMPILER_CACHE)
     set(CCACHE_OPTIONS "CCACHE_SLOPPINESS=pch_defines,time_macros")
     if(${CMAKE_CXX_COMPILER_ID} MATCHES "Clang|AppleClang")
@@ -12,6 +12,15 @@ if(NOT WIN32 AND CCACHE_TOOL_PATH AND NOT OGS_DISABLE_COMPILER_CACHE)
         VERSION 1.2.2
         OPTIONS "USE_CCACHE ON"
     )
+elseif(
+    WIN32
+    AND CCACHE_TOOL_PATH
+    AND NOT OGS_DISABLE_COMPILER_CACHE
+    AND "${CMAKE_GENERATOR}" STREQUAL "Ninja"
+)
+    set(CMAKE_C_COMPILER_LAUNCHER ${CCACHE_TOOL_PATH} CACHE STRING "" FORCE)
+    set(CMAKE_CXX_COMPILER_LAUNCHER ${CCACHE_TOOL_PATH} CACHE STRING "" FORCE)
+    message(STATUS "Using ccache (${CCACHE_TOOL_PATH}).")
 endif()
 
 if(OGS_BUILD_TESTING)

scripts/cmake/Find.cmake

@@ -36,13 +36,7 @@ find_program(CURL_TOOL_PATH curl DOC "The curl-tool")
 
 find_program(S3CMD_TOOL_PATH s3cmd DOC "S3cmd tool for uploading to Amazon S3")
 
-if(WIN32)
-    if(${CMAKE_GENERATOR} STREQUAL "Ninja")
-        find_program(CLCACHE_TOOL_PATH clcache)
-    endif()
-else()
-    find_program(CCACHE_TOOL_PATH ccache)
-endif()
+find_program(CCACHE_TOOL_PATH ccache)
 
 # Tools for web
 find_program(