Create and ship more signature libraries

[stong]

Here's a list of the current signature libraries we have available:

Linux:

• Ubuntu libc: x86, x86_64, arm32, arm64 (all versions)
• Ubuntu libgcc: x86, x86_64, arm32, arm64 (all versions)

For the sake of size, we can't ship every sig lib by default. Here's what we're currently shipping:

• Ubuntu libc, x86, x86_64 (18.04 and 16.04)
• Ubuntu libgcc, x86, x86_64 (18.04 and 16.04)

In the future, we would like to have these:

Windows:

• msvcrt: x86, x86_64

Unfortunately, we can't generate Windows signature libraries right now as we don't don't support COFF relocations yet (ref #1410 #1376 #1956).

[stong]

Please suggest and vote on which signature libraries you'd like to see in the future.

[kongo86]

Windows Def!

Update: you are correct. brain x-wired thanks!

[psifertex]

Windows doesn't need signature libraries, I don't think anyone staticly compiles user32.dll into their applications, do they? You're talking about type libraries which is over here: #1495

Good news is that's actively being worked. :-)

[joshwatson]

msvcrt and related dlls can be statically linked

[plafosse]

Added in 3.3