Add MinGW-w64 CI for stdlib and compiler specs #3451

Job	Run time
check_format	1m 34s
x86_64-gnu-test (1.7.3)	34m 40s
x86_64-gnu-test-preview_mt	5m 38s
x86_64-gnu-test (1.8.2)	36m 16s
x86_64-musl-test	38m 19s
x86_64-gnu-test (1.9.2)	21m 9s
x86_64-gnu-test (1.10.1)	34m 22s
x86_64-gnu-test (1.11.2)	33m 53s
x86_64-gnu-test (1.12.2)	34m 24s
x86_64-gnu-test (1.13.3)	35m 42s
x86_64-gnu-test (1.14.0)	34m 7s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	31m 17s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	35m 57s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	33m 10s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	33m 56s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	34m 30s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	33m 9s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	33m 2s
	9h 5m 5s

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