[RTE-294] Specify install directory libraries

[raoulstrackx]

Since mbedtls 2.28.8 they changed where libraries are installed on some platforms (e.g., on Amazon Linux it ends up in a lib64 library, on ubuntu it's lib). This causes issues like:
error: could not find native static library mbedtls, perhaps an -L flag is missing?

error: could not compile mbedtls-platform-support (lib) due to 1 previous error

The issue has been resolved on the mbedtls-sys-auto-2.28.9_old-bindgen branch in rust-mbedtls PR377 and rust-mbedtls PR378. This PR combines boths PRs and targets the master branch.

[github-actions]

Benchmark for b370ef7

Click to view benchmark

Test	Base	PR	%
Cipher/AES CBC decrypt	310.3±11.39ns	310.6±19.42ns	+0.10%
Cipher/AES CBC encrypt	218.9±11.54ns	215.6±14.55ns	-1.51%
Cipher/AES CCM decrypt	399.5±16.45ns	397.1±10.70ns	-0.60%
Cipher/AES CCM encrypt	364.6±13.09ns	354.3±9.97ns	-2.83%
Cipher/AES GCM decrypt	641.5±15.97ns	560.9±18.34ns	-12.56%
Cipher/AES GCM encrypt	563.2±37.10ns	646.5±26.51ns	+14.79%
Cipher/AES KW decrypt	668.4±14.23ns	651.1±18.14ns	-2.59%
Cipher/AES KW encrypt	599.3±17.00ns	590.1±22.58ns	-1.54%
Cipher/AES KWP decrypt	681.8±13.92ns	671.3±22.70ns	-1.54%
Cipher/AES KWP encrypt	608.8±14.09ns	613.0±30.08ns	+0.69%

[Pagten]

Looks good to me.