Revert "ELF: Add /lib and /usr/lib as default search paths."

It was causing errors like

/lib/libc.so.6 is incompatible with elf_x86_64

when linking on Fedora.

Every system has different default paths. It seems better to just trust
the driver to pass the correct -L options.

This reverts commit 262910.

llvm-svn: 262941
diff --git a/lld/ELF/LinkerScript.cpp b/lld/ELF/LinkerScript.cpp
index f9ab4db..b4580b5 100644
--- a/lld/ELF/LinkerScript.cpp
+++ b/lld/ELF/LinkerScript.cpp
@@ -396,9 +396,7 @@
 
 void ScriptParser::readSearchDir() {
   expect("(");
-  StringRef Path = next();
-  if (!Config->Nostdlib)
-    Config->SearchPaths.push_back(Path);
+  Config->SearchPaths.push_back(next());
   expect(")");
 }