Added support TCC compiler and building deps on other Unix platforms

[GermanAizek]

Im tested libzip build in Gentoo Linux, Devuan, OpenBSD.

This is a really cool Bellard project, I'm surprised how TCC compiles ~8-10 times faster than GCC and Clang.

My benchmarks for TCC compiler:

• Fix building htop for TCC compiler and experiments for Gentoo users htop-dev/htop#1978
• Fix building atop for TCC compiler and others C compilers Atoptool/atop#375

Wiki: https://en.wikipedia.org/wiki/Tiny_C_Compiler
Official site: https://bellard.org/tcc/

[0-wiz-0]

Can you please show the compiler warnings/errors this fixes?
Why does the patch install additional support cmake files?

[GermanAizek]

Can you please show the compiler warnings/errors this fixes?

@0-wiz-0,
This patch fixes warnings

[155/256] Building C object lib/CMakeFiles/zip.dir/zip_source_file_stdio.c.o
In file included from /media/devuan/437889e5-f1cd-4f29-84a0-605eacc7cd49/GIT/libzip/lib/zip_source_file_stdio.c:39:
In file included from /usr/include/fcntl.h:35:
In file included from /usr/include/x86_64-linux-gnu/bits/fcntl.h:61:
/usr/include/x86_64-linux-gnu/bits/fcntl-linux.h:142: warning: O_CLOEXEC redefined
[210/256] Building C object lib/CMakeFiles/zip.dir/zip_source_file_stdio_named.c.o
In file included from /media/devuan/437889e5-f1cd-4f29-84a0-605eacc7cd49/GIT/libzip/lib/zip_source_file_stdio_named.c:39:
In file included from /usr/include/fcntl.h:35:
In file included from /usr/include/x86_64-linux-gnu/bits/fcntl.h:61:
/usr/include/x86_64-linux-gnu/bits/fcntl-linux.h:142: warning: O_CLOEXEC redefined
[256/256] Linking C executable examples/autoclose-archive

warning: O_CLOEXEC redefined

Cmake modules were added because by default CMake does not have all library paths possible platforms and searches deps in the wrong ways. These Cmake modules can be built libzip on any Unix and BSD systems.

[dillof]

We've fixed the redefinition of O_CLOEXEC in a less intrusive manner.

As for the CMake files, they are installed by cmake itself, so no need to install them ourselves.