fix mingw64 path #366

Job	Run time
involved_authors_debug	0s
Sanity: Linux -Dusethreads	12m 41s
cygwin	14m 40s
Test dist/ modules on MacOS system perl	7m 29s
ASAN (-Accflags=-DPURIFY)	14m 46s
ASAN (-DDEBUGGING)	14m 46s
ASAN (-Dusethreads)	14m 47s
dist-modules (latest)	3m 39s
dist-modules (5.24)	3m 38s
dist-modules (5.10)	3m 19s
dist-modules (5.8)	3m 22s
install	11m 57s
linux i386/ubuntu (-Dusedevel)	14m 29s
linux (-Uusethreads)	11m 18s
linux (-Duseshrplib -Dusequadmath -Dusecbacktrace -Dusethreads)	13m 3s
linux (-Duserelocatableinc)	14m 44s
linux (-Dcc='clang')	11m 23s
linux (-Dcc='g++')	14m 37s
linux (-Accflags=-DSILENT_NO_TAINT_SUPPORT)	11m 44s
linux (-Accflags=-DNO_TAINT_SUPPORT)	12m 39s
Windows mingw64	11m 34s
minitest	4m 47s
PERL_UNICODE (-Uusethreads)	10m 46s
PERL_UNICODE (-Dusethreads -Accflags=-DPURIFY -Dcc='gcc -fsanitize=address' -Dld='gcc -fsanitize=...	14m 45s
macOS (big sur) xcode 13 (-Uusethreads)	9m 51s
macOS (big sur) xcode 13 (-Duseithreads -Duseshrplib)	11m 14s
Windows msvc142	56s
	4h 32m 54s

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