ccache: new binary recipe

[perseoGI]

Credits: https://github.com/mradugin/cmake-findccache/blob/47c20441ce923d1751faf104d1914204acdd31d7/

TODO

• Check if we want to use the Visual Studio auto injection part
• Consider adding the rest of the toolchain file from cmake-findccache repo

[CLAassistant]

All committers have signed the CLA.

[KUGA2]

Have you successfully tested this with Windows+CMake+MSVC+Debug/RelWithDebInfo? Because in my tests this does not work. ccache does not cache anything, cause ccache/ccache#1040
(You can see then when you print debug logs of CCACHE)

You need to change the debug info type:

By default Visual Studio generators will use /Zi which is not compatible
with ccache, so tell Visual Studio to use /Z7 instead.
message(STATUS "Setting MSVC debug information format to 'Embedded'")
set(CMAKE_MSVC_DEBUG_INFORMATION_FORMAT "$<$<CONFIG:Debug,RelWithDebInfo>:Embedded>")

https://github.com/ccache/ccache/wiki/MS-Visual-Studio

However, at least in our case, changing this is not acceptable. We build RelWithDebInfo, but do not want to distribute debug info. And splitting, like with gcc/elf is not possible AFAIK.

[KUGA2]

Why is this a new remote/repo/recipe? Why can't we integrate that in the regular ccache (conan-center) recipe? What is different if auto_inject=False (default)?

[KUGA2]

You can also verify that ccache works:
In the test project, change the cache_dir (CCACHE_DIR) to a temporary, clean dir. Then after build, verify that the cache has 1 entry (ccache -s)