build: fix misplaced comma in ldflags #2084

Job	Run time
Build slim tarball	1m 33s
aarch64-darwin: with shared libraries	33m 13s
x86_64-linux: with shared libraries	25m 54s
aarch64-linux: with shared libraries	21m 42s
x86_64-darwin: with shared libraries	1h 32m 49s
	2h 55m 11s

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