build-mingw-w64: Update to the latest version

This fixes a regression in the previously pinned version, where
the asprintf function produced undefined references when using UCRT.

build-mingw-w64.sh

@@ -18,7 +18,7 @@ set -e
 
 : ${DEFAULT_WIN32_WINNT:=0x601}
 : ${DEFAULT_MSVCRT:=ucrt}
-: ${MINGW_W64_VERSION:=62259d490b684fcc3ba4ef0b36427d89cc2817f7}
+: ${MINGW_W64_VERSION:=c4617bac7b53234d9adf47a23cdfd907c5ad10fe}
 unset HOST
 
 while [ $# -gt 0 ]; do