Readd hostfxr-sys dep #258

Job	Run time
cross (beta, aarch64-unknown-linux-gnu)	35s
cross (beta, armv7-unknown-linux-gnueabihf)	33s
documentation (ubuntu-latest)	1m 35s
clippy (windows-latest)	1m 53s
test (beta, x86_64-apple-darwin, 6.0)	33s
test (beta, x86_64-unknown-linux-gnu, 7.0)	2m 56s
test (beta, i686-pc-windows-msvc, 8.0)	5m 17s
fmt (ubuntu-latest)	12s
test (beta, x86_64-apple-darwin, 8.0)	43s
test (beta, x86_64-pc-windows-msvc, 7.0)	5m 20s
test (beta, x86_64-unknown-linux-gnu, 6.0)	2m 38s
test (beta, x86_64-pc-windows-msvc, 8.0)	5m 13s
examples (beta, call-managed-function)	1m 0s
examples (beta, run-app)	1m 5s
documentation (windows-latest)	3m 46s
test (beta, x86_64-pc-windows-msvc, 6.0)	5m 6s
test (beta, i686-pc-windows-msvc, 7.0)	5m 56s
examples (beta, passing-parameters)	58s
test (beta, i686-pc-windows-msvc, 6.0)	6m 55s
fmt (windows-latest)	36s
examples (beta, run-app-with-args)	1m 1s
test (beta, x86_64-apple-darwin, 7.0)	37s
clippy (ubuntu-latest)	45s
examples (beta, return-string-from-managed)	52s
test (beta, x86_64-unknown-linux-gnu, 8.0)	2m 45s
	58m 50s

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