Move list of mysqls src dirs into lib/mtr_gcov.pl as it's only used from there

mysql-test/lib/mtr_gcov.pl

@@ -23,12 +23,28 @@ sub gcov_prepare () {
     -or -name \*.da | xargs rm`;
 }
 
+# Used by gcov
+our @mysqld_src_dirs=
+  (
+   "strings",
+   "mysys",
+   "include",
+   "extra",
+   "regex",
+   "isam",
+   "merge",
+   "myisam",
+   "myisammrg",
+   "heap",
+   "sql",
+  );
+
 sub gcov_collect () {
 
   print "Collecting source coverage info...\n";
   -f $::opt_gcov_msg and unlink($::opt_gcov_msg);
   -f $::opt_gcov_err and unlink($::opt_gcov_err);
-  foreach my $d ( @::mysqld_src_dirs )
+  foreach my $d ( @mysqld_src_dirs )
   {
     chdir("$::glob_basedir/$d");
     foreach my $f ( (glob("*.h"), glob("*.cc"), glob("*.c")) )

mysql-test/mysql-test-run.pl

@@ -87,22 +87,6 @@ require "lib/mtr_stress.pl";
 
 $Devel::Trace::TRACE= 1;
 
-# Used by gcov
-our @mysqld_src_dirs=
-  (
-   "strings",
-   "mysys",
-   "include",
-   "extra",
-   "regex",
-   "isam",
-   "merge",
-   "myisam",
-   "myisammrg",
-   "heap",
-   "sql",
-  );
-
 ##############################################################################
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