The toolchain builds just fine without the git repository (tested on
windows and linux). We can skip setting up the repo and apply the
patches directly when we aren't working on the toolchain itself. A
flag `--dev` has been added for cases when git repo is needed. Without
the flag, regular patch is applied. This significantly improves build
times for first time builds.
This should give a significant boost to Travis speeds, because most of the
compile time is spent building the toolchain over and over again.
However, the toolchain (or libc or libm) changes only rarely,
so most rebuilds can skip this step.
The hashing has been put into a separate file to keep it
as decoupled as possible from BuiltIt.sh.
Toolchain build makes git repo out of toolchain to allow patching
Fix Makefiles to use new libstdc++
Parameterize BuildIt with default TARGET of i686 but arm is experimental
Ports/.port_include.sh, Toolchain/BuildIt.sh, Toolchain/UseIt.sh
have been left largely untouched due to use of Bash-exclusive
functions and variables such as $BASH_SOURCE, pushd and popd.
When we used "make install" in the past, the "install" target would pull
in the library targets as dependencies, and everything got built that way.
Now that we use "install.sh" instead, we have to build things manually.
