Fix DB update when julia launcher is symlinked #636

Job	Run time
test-juliaup (x86_64-pc-windows-msvc)	6m 8s
test-juliaup (x86_64-pc-windows-gnu)	6m 13s
test-juliaup (x86_64-apple-darwin)	5m 22s
check-juliaup (x86_64-pc-windows-msvc-windowsstore)	1m 46s
test-juliaup (x86_64-unknown-linux-gnu)	5m 18s
check-juliaup (x86_64-pc-windows-msvc-windowsappinstaller)	2m 49s
test-juliaup (x86_64-unknown-linux-musl)	3m 24s
check-juliaup (x86_64-pc-windows-gnu-msi)	3m 2s
test-juliaup (i686-pc-windows-msvc)	7m 2s
check-juliaup (x86_64-pc-windows-gnu-msi)	2m 13s
test-juliaup (i686-pc-windows-gnu)	12m 28s
check-juliaup (x86_64-apple-darwin)	1m 27s
check-juliaup (x86_64-unknown-linux-gnu)	2m 16s
check-juliaup (x86_64-unknown-linux-musl)	1m 39s
check-juliaup (i686-pc-windows-msvc-windowsstore)	1m 55s
check-juliaup (i686-pc-windows-msvc-windowsappinstaller)	2m 4s
check-juliaup (i686-pc-windows-gnu-msi)	2m 40s
check-juliaup (i686-unknown-linux-gnu)	1m 33s
check-juliaup (i686-unknown-linux-musl)	3m 9s
check-juliaup (aarch64-unknown-linux-gnu)	2m 54s
check-juliaup (aarch64-unknown-linux-musl)	1m 46s
check-juliaup (aarch64-apple-darwin)	54s
	1h 18m 2s

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