BUGFIX: Adds the static libraries from cgo_deps to the link command line

Not sure why this wasn't added here.

Author: filmil

go/private/actions/link.bzl

@@ -140,6 +140,18 @@ def emit_link(
     ]))
     extldflags.extend(cgo_rpaths)
 
+    # BUG: Have we forgotten about the .a files?
+    for f in archive.cgo_deps.to_list():
+        extldflags.extend([
+            "-L", f.dirname,
+            # This shenaningan converts "libzmq.a" into "-lzmq" as one would
+            # want in a CC command line.
+            "-l{}".format(f.basename[3:-2])]
+        )
+    # We will need to link with stdc++ too if we want C++ stdlib to work.
+    # This is probably not correct for C programs. What to do?
+    extldflags.extend(["-lstdc++"])
+
     # Process x_defs, and record whether stamping is used.
     stamp_x_defs_volatile = False
     stamp_x_defs_stable = False
@@ -188,6 +200,7 @@ def emit_link(
     ]
     inputs = depset(direct = inputs_direct, transitive = inputs_transitive)
 
+
     go.actions.run(
         inputs = inputs,
         outputs = [executable],