Merge pull request #25 from asergi/master

Fix build on Arch Linux with gcc 4.8
added support for the GNU gold linker
damn spelling error... elif GNU gold
tabs, not spaces
fix typo
add travis status icon
musl-gcc does output cc -v like we want it; try -dumpmachine first
Treat musl-gcc as a native compiler.

XXX: is there a better way to decide if something is a cross-compiler?
pull in latest queue.h (which is now portable)
Source for buildrump.sh git rev 905d25ef7f52325015046d01a0193d38563ed5d4
use queue.h from NetBSD sources for userland components
pull in latest ugenhc, contains a build fix which is now necessary
Source for buildrump.sh git rev 3bc25592e140917b369aad349547bda2e476fcf8
cherry-pick fixes to get rid of daddr_t in rumpvnodeif
Source for buildrump.sh git rev c0ea9d437eaac0cf07db05db55bbf54f65133ea5
cherry-pick newer sockin, issue #27
Source for buildrump.sh git rev f4642ddb8707c41febb6096866e65e0d36b78c0e