GCC testsuite no longer available through SVN

[Emoun]

The nightly test cannot access GCC's svn repository to get the GCC test suite that we use for testing LLVM:

-- Found Subversion: /usr/bin/svn (found version "1.9.7") 
svn: E170013: Unable to connect to a repository at URL 'svn://gcc.gnu.org/svn/gcc/trunk/gcc/testsuite/gcc.c-torture/execute'
svn: E000101: Can't connect to host 'gcc.gnu.org': Network is unreachable

We are therefore down to only 118 tests from over 1000.

As far as I can tell, GCC has moved to git and apparently turned off their svn repository. Links to the svn repository redirect to their git help page.

We should fix the test to get the testsuite through git.

[Emoun]

It seems the SVN repository is up again, today's nightly test managed to download the testsuite. Though, since GCC has migrated to git permanently we should probably switch to downloading it using git too.

Therefore, I'm keeping this open for now.