.gdbinit: initialize color sequences

* .gdbinit (hook-run): initialize color sequences for each runs.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39624 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

.gdbinit

@@ -1,3 +1,9 @@
+define hook-run
+  set $color_type = 0
+  set $color_highlite = 0
+  set $color_end = 0
+end
+
 define ruby_gdb_init
   if !$color_type
     set $color_type = "\033[31m"