Use --color-diagnostics instead of -color-diagnostics.

Solaris ld interprets -color-diagnostics as a -c option, so it is
better to use --color-diagnostics instead. lld accepts both.

Differential Revision: https://reviews.llvm.org/D35327

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307850 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed