Cygport improvements

[JonY]

Hello,

I am planning to bring mingw-w64 to cygwin. Here are some nits I found 
when working with it.

* It sets CC=gcc
While not a major issue, it does present some issues when cross 
compiling the mingw-w64 CRT.

* Implicitly setting --prefix=/usr
While I understand this is suitable for native builds, perhaps adding 
some cross compile logic to disable this?

* Libtool logic too smart
This is partly a GCC issue too, since it insists installing dlls to 
PREFIX/bin. However, manually moving around the dlls and fixing up the 
.la paths after install causes cygport to fail with "[ ../../..: Unary 
operator expected.", "../../.. not installed" of sorts error around 
src_postinst.cygpart:590.

Packaging GCC presents some challenge, there is a packaging hack in the 
src_install part. I will try to fix that in GCC.
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