Do not link against `DbgHelp` for MinGW-w64 build #3488

Job	Run time
check_format	1m 39s
x86_64-gnu-test (1.7.3)	35m 23s
x86_64-gnu-test (1.8.2)	34m 7s
x86_64-gnu-test (1.9.2)	36m 38s
x86_64-gnu-test (1.10.1)	33m 51s
x86_64-gnu-test (1.11.2)	36m 49s
x86_64-gnu-test (1.12.2)	34m 13s
x86_64-gnu-test (1.13.3)	34m 40s
x86_64-gnu-test (1.14.0)	34m 24s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	32m 59s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	35m 32s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	34m 13s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	35m 16s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	34m 35s
x86_64-gnu-test-preview_mt	5m 33s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	33m 32s
x86_64-musl-test	40m 3s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	33m 44s
	9h 27m 11s

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