Update README.md: How to use libc without installation
Currently, only the installation is described. Additionally, the use of libc without installation should be explained.
- configure, make
- which files are needed: libc.a, headers (copying them into the project)
- which flags to use: -L, -l, -I
Also, the description on how to install the standard library should be updated. (see cryptfx tut)
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