Partially from @jarekpelczar's work, but only certain pieces that
were needed, and the rest is either from earlier GCC patches
or is my own work.
With this, GCC 7 can now build Haiku.
* Solved conflicts with the libtool related files by simply using the
vendor versions. IIRC the haiku related changes to libtool and
autoconf were relevant only for the binutils.
* Solved {libstdc++-v3,libmudflap}/configure conflicts by re-running
autoconf for these directories.
I'm already working on fixing the Haiku build, so please don't do the
same.
git-svn-id: file:///srv/svn/repos/haiku/buildtools/trunk@20318 a95241bf-73f2-0310-859d-f6bbb57e9c96