Expand `DESTDIR` outside of prefixed dirs (#15444) #13496

Job	Run time
check_format	1m 37s
x86_64-gnu-test (1.7.3)	36m 54s
x86_64-gnu-test-preview_mt	5m 45s
x86_64-musl-test	36m 21s
x86_64-gnu-test (1.8.2)	34m 39s
x86_64-gnu-test (1.9.2)	34m 59s
x86_64-gnu-test (1.10.1)	35m 9s
x86_64-gnu-test (1.11.2)	35m 33s
x86_64-gnu-test (1.12.2)	33m 34s
x86_64-gnu-test (1.13.3)	35m 39s
x86_64-gnu-test (1.14.1)	33m 37s
x86_64-gnu-test (1.15.1)	35m 6s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	34m 21s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	33m 43s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	34m 52s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	34m 58s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	35m 17s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	32m 40s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	35m 30s
	10h 0m 14s

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