build-mingw-w64: Update to the current version from February 9th

Among lots of other changes, this now includes import libraries for
OpenGL for arm targets, and also hooks up timespec_get for UCRT.

build-mingw-w64.sh

@@ -18,7 +18,7 @@ set -e
 
 : ${DEFAULT_WIN32_WINNT:=0x601}
 : ${DEFAULT_MSVCRT:=ucrt}
-: ${MINGW_W64_VERSION:=586baa17bb41dd78addd8cbb6415cfd24d24e925}
+: ${MINGW_W64_VERSION:=9ed7b8dcfb3186fdfed1be2a374963458af618b1}
 
 while [ $# -gt 0 ]; do
     case "$1" in