ci: add tests and artifacts for windows-11-arm

integrate armv8 and armv8-dotprod builds on windows-11-arm in ci, creating the corresponding artifacts.
Correct Makefile to drop warnings when providing a CXX, add MINGW ARM64 to get_native_properties.sh

fixes https://github.com/official-stockfish/Stockfish/issues/5640
closes https://github.com/official-stockfish/Stockfish/pull/6078

No functional change

src/Makefile

@@ -567,11 +567,16 @@ ifeq ($(COMP),ndk)
 	LDFLAGS += -static-libstdc++ -pie -lm -latomic
 endif
 
+### Allow overwriting CXX from command line
+ifdef COMPCXX
+	CXX=$(COMPCXX)
+endif
+
 # llvm-profdata must be version compatible with the specified CXX (be it clang, or the gcc alias)
 # make -j profile-build CXX=clang++-20 COMP=clang
 # Locate the version in the same directory as the compiler used,
 # with fallback to a generic one if it can't be located
-	LLVM_PROFDATA := $(dir $(realpath $(shell which $(CXX))))llvm-profdata
+	LLVM_PROFDATA := $(dir $(realpath $(shell which $(CXX) 2> /dev/null)))llvm-profdata
 ifeq ($(wildcard $(LLVM_PROFDATA)),)
 	LLVM_PROFDATA := llvm-profdata
 endif
@@ -590,11 +595,6 @@ else
 	endif
 endif
 
-### Allow overwriting CXX from command line
-ifdef COMPCXX
-	CXX=$(COMPCXX)
-endif
-
 ### Sometimes gcc is really clang
 ifeq ($(COMP),gcc)
 	gccversion := $(shell $(CXX) --version 2>/dev/null)