src: fix pointer alignment #2192

Job	Run time
Build slim tarball	1m 27s
x86_64-darwin: with shared libraries	9m 27s
aarch64-darwin: with shared libraries	9m 38s
x86_64-linux: with shared libraries	9m 19s
aarch64-linux: with shared libraries	9m 17s
	39m 8s

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