Use empty prelude for compiler tools specs #13027

Job	Run time
x86_64-gnu-test (1.7.3)	34m 9s
x86_64-gnu-test-preview_mt	5m 38s
x86_64-gnu-test (1.8.2)	35m 1s
x86_64-musl-test	35m 46s
x86_64-gnu-test (1.9.2)	34m 20s
x86_64-gnu-test (1.10.1)	34m 3s
check_format	1m 35s
x86_64-gnu-test (1.11.2)	33m 55s
x86_64-gnu-test (1.12.2)	37m 55s
x86_64-gnu-test (1.13.3)	32m 27s
x86_64-gnu-test (1.14.0)	32m 16s
x86_64-gnu-test (1.0.0, FLAGS=-Dwithout_ffi USE_PCRE1=true)	31m 47s
x86_64-gnu-test (1.1.1, FLAGS=-Dwithout_ffi USE_PCRE1=true)	32m 17s
x86_64-gnu-test (1.2.2, USE_PCRE1=true)	31m 49s
x86_64-gnu-test (1.3.2, USE_PCRE1=true)	32m 42s
x86_64-gnu-test (1.4.1, USE_PCRE1=true)	33m 4s
x86_64-gnu-test (1.5.1, USE_PCRE1=true)	35m 52s
x86_64-gnu-test (1.6.2, USE_PCRE1=true)	34m 50s
	9h 9m 26s

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