grep: -K is not an option: remove it from list

The presence of "K" in the short-option string meant that
an erroneous "grep -K ..." would fail with a bare Usage/Try...
message, without the usual "invalid option -- 'K'".  With this
removal, now grep prints the expected invalid option diagnostic.
* src/main.c (short_options): Remove "K".
Reported by Петр Досычев in
http://thread.gmane.org/gmane.comp.gnu.grep.bugs/4488

1 files changed, 1 insertions, 1 deletions

diff --git a/src/main.c b/src/main.c
index c5a84898..cb6da2ca 100644
--- a/src/main.c
+++ b/src/main.c
@@ -276,7 +276,7 @@ static struct exclude *included_patterns;
 static struct exclude *excluded_directory_patterns;
 /* Short options.  */
 static char const short_options[] =
-"0123456789A:B:C:D:EFGHIPTUVX:abcd:e:f:hiKLlm:noqRrsuvwxyZz";
+"0123456789A:B:C:D:EFGHIPTUVX:abcd:e:f:hiLlm:noqRrsuvwxyZz";
 
 /* Non-boolean long options that have no corresponding short equivalents.  */
 enum