[committed] i386.c diagnostics fix

[Jakub Jelinek]

Hi!

While working on the just posted patch, I've noticed another spot
in i386.c that uses incorrect capitalization in diagnostics.

Fixed thusly, bootstrapped/regtested on x86_64-linux and i686-linux,
committed to trunk as obvious.

2017-11-20  Jakub Jelinek  <ja...@redhat.com>

        * config/i386/i386.c (parse_mtune_ctrl_str): Start diagnostics
        with lower case letter.

--- gcc/config/i386/i386.c.jj   2017-11-20 11:02:42.000000000 +0100
+++ gcc/config/i386/i386.c      2017-11-20 11:44:16.286754295 +0100
@@ -3280,7 +3280,7 @@ parse_mtune_ctrl_str (bool dump)
             }
         }
       if (i == X86_TUNE_LAST)
-        error ("Unknown parameter to option -mtune-ctrl: %s",
+        error ("unknown parameter to option -mtune-ctrl: %s",
                clear ? curr_feature_string - 1 : curr_feature_string);
       curr_feature_string = next_feature_string;
     }

        Jakub