build: set build type and per-build-type flags as early as possible

With the exception of the first c++ checks, this ensures that compiler tests
are never run with the wrong build type's flags.

Co-Authored-By: Hennadii Stepanov <32963518+hebasto@users.noreply.github.com>

CMakeLists.txt

@@ -70,6 +70,7 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF)
 
 list(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake/module)
+include(ProcessConfigurations)
 
 #=============================
 # Configurable options
@@ -230,8 +231,6 @@ if(BUILD_FOR_FUZZING)
   )
 endif()
 
-include(ProcessConfigurations)
-
 include(TryAppendCXXFlags)
 include(TryAppendLinkerFlag)