build: fix inconsistent quoting in `Makefile` #2045

Job	Run time
Build slim tarball	1m 36s
x86_64-linux: with shared libraries	2h 27m 8s
x86_64-darwin: with shared libraries	52m 5s
aarch64-darwin: with shared libraries	2h 2m 34s
aarch64-linux: with shared libraries	2h 21m 57s
	7h 45m 20s

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