auto merge of #11121 : vadimcn/rust/no-c++2, r=alexcrichton

This PR removes Rust's dependency on C++ for exception handling. Instead, it will use the unwind library API directly.

closes #10469

src/etc/mklldeps.py

@@ -59,6 +59,7 @@ for llconfig in sys.argv[3:]:
     for lib in out.strip().split(' '):
         lib = lib[2:] # chop of the leading '-l'
         f.write("#[link(name = \"" + lib + "\", kind = \"static\")]\n")
+    f.write("#[link(name = \"stdc++\")]\n")
     if os == 'win32':
         f.write("#[link(name = \"imagehlp\")]\n")
     f.write("extern {}\n")