Link rustllvm statically, and distribute a static snapshot

In order to keep up to date with changes to the libraries that `llvm-config`
spits out, the dependencies to the LLVM are a dynamically generated rust file.
This file is now automatically updated whenever LLVM is updated to get kept
up-to-date.

At the same time, this cleans out some old cruft which isn't necessary in the
makefiles in terms of dependencies.

Closes #10745
Closes #10744

src/etc/mklldeps.py

@@ -0,0 +1,58 @@
+# xfail-license
+
+import os
+import sys
+import subprocess
+
+components = sys.argv[1].split(' ')
+
+print """// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// WARNING: THIS IS A GENERATED FILE, DO NOT MODIFY
+//          take a look at src/etc/mklldeps.py if you're interested
+"""
+
+for llconfig in sys.argv[2:]:
+    print
+
+    proc = subprocess.Popen([llconfig, '--host-target'], stdout = subprocess.PIPE)
+    out, err = proc.communicate()
+    arch, os = out.split('-', 1)
+    arch = 'x86' if arch == 'i686' or arch == 'i386' else arch
+    if 'darwin' in os:
+        os = 'macos'
+    elif 'linux' in os:
+        os = 'linux'
+    elif 'freebsd' in os:
+        os = 'freebsd'
+    elif 'android' in os:
+        os = 'android'
+    elif 'win' in os or 'mingw' in os:
+        os = 'win32'
+    cfg = [
+        "target_arch = \"" + arch + "\"",
+        "target_os = \"" + os + "\"",
+    ]
+
+    print "#[cfg(" + ', '.join(cfg) + ")]"
+
+    args = [llconfig, '--libs']
+    args.extend(components)
+    proc = subprocess.Popen(args, stdout = subprocess.PIPE)
+    out, err = proc.communicate()
+
+    for lib in out.strip().split(' '):
+        lib = lib[2:] # chop of the leading '-l'
+        print "#[link(name = \"" + lib + "\", kind = \"static\")]"
+    if os == 'win32':
+        print "#[link(name = \"pthread\")]"
+        print "#[link(name = \"imagehlp\")]"
+    print "extern {}"