build: fix inconsistent quoting in `Makefile` #2055

Job	Run time
Build slim tarball	1m 34s
aarch64-darwin: with shared libraries	2h 11m 24s
x86_64-darwin: with shared libraries	46m 50s
aarch64-linux: with shared libraries	2h 24m 8s
x86_64-linux: with shared libraries	2h 57m 8s
	8h 21m 4s

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