build-mingw-w64: Bump to the latest version as of Feb 7th

This fixes the availability of __cpuidex for Clang 18.

Author: mstorsjo

build-mingw-w64.sh

@@ -18,7 +18,7 @@ set -e
 
 : ${DEFAULT_WIN32_WINNT:=0x601}
 : ${DEFAULT_MSVCRT:=ucrt}
-: ${MINGW_W64_VERSION:=1415ff7f9b835e9ea39864c9625ec6fb72682918}
+: ${MINGW_W64_VERSION:=a4c0c1d00d140d69a2c72f6ca0d49c91bdb2b08c}
 
 CFGUARD_FLAGS="--enable-cfguard"