Fix Makefile for clang 16

The clang 16 release will remove the -fexperimental-new-pass-manager
flag (see llvm/llvm-project@69b2b72).
Thus, the commit adapts the Makefile to use this flag only for older
clang versions.

closes official-stockfish/Stockfish#4437

No functional change

src/Makefile

@@ -539,7 +539,10 @@ ifeq ($(optimize),yes)
 	endif
 
 	ifeq ($(comp),clang)
-		CXXFLAGS += -fexperimental-new-pass-manager
+		clangmajorversion = $(shell $(CXX) -dumpversion 2>/dev/null | cut -f1 -d.)
+		ifeq ($(shell expr $(clangmajorversion) \< 16),1)
+			CXXFLAGS += -fexperimental-new-pass-manager
+		endif
 	endif
 endif