[ELF] - Fix for: bug 29115 - linkerscript does not support non-wildcard filename spec.

FreeBSD/mips script has non-wildcard filename specifications:
.text :
{
 start.o(.text*)

Patch adds support for that, this is PR29115.

Differential revision: https://reviews.llvm.org/D23839

llvm-svn: 280069