Use consistent quoting in linker messages.

Using single quotes can be more convenient -- because there's no need to
escape -- but the vast majority of existing quoting was done with double
quotes, so move in that direction.

Bug: http://b/27524191
Change-Id: I8f58593120e4c8aeaec45e16fc0178e9c162454d
diff --git a/linker/linker_dlwarning.cpp b/linker/linker_dlwarning.cpp
index cd76533..c53ad66 100644
--- a/linker/linker_dlwarning.cpp
+++ b/linker/linker_dlwarning.cpp
@@ -30,9 +30,8 @@
   current_msg = current_msg + basename(sopath) + ": " + message;
 
   if (value != nullptr) {
-    current_msg = current_msg + " \'" + value + "\'";
+    current_msg = current_msg + " \"" + value + "\"";
   }
-
 }
 
 // Resets the current one (like dlerror but instead of