Remove duplicate -B entry for host linux clang ldflags

In cc/cc.go, we already add -B{GccRoot}/{GccTriple}/bin to all clang
cflags, asflags, and ldflags. So we don't need to add a linux specific
version here.

Change-Id: I42d71662c78a8170463dfec932a633e4d4ff52c8

cc/x86_linux_host.go

@@ -71,7 +71,6 @@ var (
 	linuxClangLdflags = append(clangFilterUnknownCflags(linuxLdflags), []string{
 		"--gcc-toolchain=${linuxGccRoot}",
 		"--sysroot ${linuxGccRoot}/sysroot",
-		"-B${linuxGccRoot}/${linuxGccTriple}/bin",
 	}...)
 
 	linuxX86ClangLdflags = append(clangFilterUnknownCflags(linuxX86Ldflags), []string{