CMake: add option to disable pre-compiled headers

./tools/utils_maintenance/code_clean failed to operate on any sources
that used pre-compiled headers.

source/CMakeLists.txt

@@ -7,14 +7,6 @@ if(WITH_LEGACY_OPENGL)
 endif()
 
 if(WITH_CLANG_TIDY AND NOT MSVC)
-  if(NOT CMAKE_C_COMPILER_ID MATCHES "Clang")
-    message(WARNING "Currently Clang-Tidy might fail with GCC toolchain, switch to Clang toolchain if that happens")
-    if(COMMAND target_precompile_headers)
-      message(STATUS "Clang-Tidy and GCC precompiled headers are incompatible, disabling precompiled headers")
-      set(CMAKE_DISABLE_PRECOMPILE_HEADERS ON)
-    endif()
-  endif()
-
   find_package(ClangTidy REQUIRED)
   set(CMAKE_C_CLANG_TIDY
     ${CLANG_TIDY_EXECUTABLE};--extra-arg=-Wno-error=unknown-warning-option)