windows: Fixed MSYS detection in CCCL. #2711

Job	Run time
dpdk gcc (ubuntu-24.04)	10s
build oss-fuzz fuzzers	2m 55s
osx clang --disable-ssl	1m 33s
libreswan (ubuntu-24.04)	6s
linux deb no dpdk	4m 48s
linux rpm fedora	3m 34s
clang-analyze-cache	11m 47s
linux gcc c99	3m 52s
linux clang c99	2m 38s
linux gcc --disable-ssl	2m 32s
linux gcc test	8m 57s
linux clang --disable-ssl	2m 35s
linux clang address,undefined check-kernel -100	12m 44s
linux gcc check check-dpdk dpdk	20m 13s
linux clang address,undefined test	16m 27s
linux gcc test --enable-shared	11m 2s
linux gcc dpdk --enable-shared	3m 48s
linux clang dpdk-shared	2m 46s
linux gcc test -ljemalloc	9m 21s
linux clang test -ljemalloc	8m 41s
linux gcc check-offloads 100-	12m 48s
linux clang test --enable-shared	11m 13s
linux gcc check-kernel -100	10m 29s
linux clang dpdk --enable-shared	3m 46s
linux gcc check-offloads -100	10m 14s
linux clang address,undefined check-kernel 100-	19m 53s
linux gcc m32 --disable-ssl	3m 53s
linux gcc dpdk check-system-userspace	13m 2s
linux clang check check-dpdk dpdk	19m 56s
linux gcc --enable-afxdp	2m 36s
linux gcc check-ovsdb-cluster	6m 53s
linux clang address,undefined dpdk check-system-userspace	16m 49s
linux gcc dpdk check-system-tso	12m 36s
linux gcc dpdk-shared --enable-shared	3m 32s
linux clang dpdk-shared --enable-shared	3m 34s
linux gcc check-kernel 100-	17m 18s
linux clang --enable-afxdp	2m 51s
linux gcc dpdk-shared	4m 48s
linux gcc dpdk check-afxdp	12m 14s
clang-analyze	11m 16s
	5h 30m 10s

Provide feedback