build: fix misplaced comma in ldflags #2212

Job	Run time
Build slim tarball	1m 29s
x86_64-linux: with shared libraries	26m 36s
aarch64-linux: with shared libraries	22m 3s
x86_64-darwin: with shared libraries	42m 23s
aarch64-darwin: with shared libraries	24m 31s
	1h 57m 2s

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