patch 7.4.941

Problem:    There is no way to ignore case only for tag searches.
Solution:   Add the 'tagcase' option. (Gary Johnson)

src/option.h

@@ -820,6 +820,14 @@ static char *(p_swb_values[]) = {"useopen", "usetab", "split", "newtab", "vsplit
 #define SWB_NEWTAB		0x008
 #define SWB_VSPLIT		0x010
 EXTERN int	p_tbs;		/* 'tagbsearch' */
+EXTERN char_u	*p_tc;		/* 'tagcase' */
+EXTERN unsigned tc_flags;       /* flags from 'tagcase' */
+#ifdef IN_OPTION_C
+static char *(p_tc_values[]) = {"followic", "ignore", "match", NULL};
+#endif
+#define TC_FOLLOWIC		0x01
+#define TC_IGNORE		0x02
+#define TC_MATCH		0x04
 EXTERN long	p_tl;		/* 'taglength' */
 EXTERN int	p_tr;		/* 'tagrelative' */
 EXTERN char_u	*p_tags;	/* 'tags' */
@@ -1081,6 +1089,7 @@ enum
     , BV_SW
     , BV_SWF
     , BV_TAGS
+    , BV_TC
     , BV_TS
     , BV_TW
     , BV_TX