Remove the old library names. These were unused since rustboot.

Right now rustc hardcodes -lrustllvm. The idea is to instead remember all the native
modules used and convert them to -l directives to the linker. In the case of a
library that is installed in an unusual location, Graydon suggested using metadata:

native module foo = "bar" {
}

src/comp/lib/llvm.rs

@@ -125,7 +125,7 @@ const uint LLVMRealULT = 12u;
 const uint LLVMRealULE = 13u;
 const uint LLVMRealUNE = 14u;
 
-native mod llvm = llvm_lib {
+native mod llvm = "rustllvm" {
 
     type ModuleRef;
     type ContextRef;
@@ -883,9 +883,6 @@ native mod llvm = llvm_lib {
     fn LLVMLinkModules(ModuleRef Dest, ModuleRef Src) -> Bool;
 }
 
-native mod rustllvm = llvm_lib {
-}
-
 /* Slightly more terse object-interface to LLVM's 'builder' functions. For the
  * most part, build.Foo() wraps LLVMBuildFoo(), threading the correct
  * BuilderRef B into place.  A BuilderRef is a cursor-like LLVM value that

src/comp/rustc.rc

@@ -80,23 +80,7 @@ auth middle::trans = unsafe;
 auth lib::llvm = unsafe;
 
 mod lib {
-    alt (target_os) {
-        case ("win32") {
-            let (llvm_lib = "rustllvm.dll") {
-                mod llvm;
-            }
-        }
-        case ("macos") {
-            let (llvm_lib = "librustllvm.dylib") {
-                mod llvm;
-            }
-        }
-        case (_) {
-            let (llvm_lib = "librustllvm.so") {
-                mod llvm;
-            }
-        }
-    }
+    mod llvm;
 }
 
 // Local Variables: