gn: Add runtime_link_output to tool("solib")

tools/gn/target.cc

Index: tools/gn/target.cc
diff --git a/tools/gn/target.cc b/tools/gn/target.cc
index 7dd192181ea891e96aa6a9762470fc63af02496e..594b368a5522911faca499e00da771da6c8413eb 100644
--- a/tools/gn/target.cc
+++ b/tools/gn/target.cc
@@ -531,6 +531,13 @@ void Target::FillOutputFiles() {
                   this, tool, tool->depend_output());
         }
       }
+      if (tool->runtime_link_output().empty()) {
+        runtime_link_output_file_ = link_output_file_;

[scottmg, 2016/02/11 02:06:28]

Why did you not put this up in the block with the other two?

[Nico, 2016/02/11 02:09:03]

The other two must both be set or not set and that's checked by the validator.
This one must not necessarily be set; it defaults to link_output (since that
does the right thing on non-windows)

+      } else {
+          runtime_link_output_file_ =
+              SubstitutionWriter::ApplyPatternToLinkerAsOutputFile(
+                  this, tool, tool->runtime_link_output());
+      }
       break;
     case UNKNOWN:
     default: