lib/libcrypt: remove ldscript hack

[fuz]

Summary

This hack caused the bootstrap build to fail on macOS as macOS ld(1) does
not support static libraries being linker scripts. As a consequence, static
consumers of libcrypt now need to link with -lcrypt -lmd instead of just
-lmd.

Relnotes: yes
Fixes: cb5e41b160838880de7d03100afa02e4edee5a9e (D47062)

Test Plan

build test successful, CI tests no longer fail.

[fuz]

Alternatively, D47465 fixes the ldscript hack to cross-build on macOS.

[fuz]

@bapt has managed to fix the issue causing the bootstrap to fail on macOS. Seems like we don't need to break compatibility after all.