add missing #ifdef

git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@2310 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

src/chars.c

@@ -762,6 +762,7 @@ size_t mbstrnlen(const char *s, size_t maxlen)
 #endif
 }
 
+#ifndef DISABLE_TABCOMP
 /* Find the one-based position of the last occurrence of character c in
  * the first n characters of s.  Return 0 if c is not found. */
 size_t strrchrn(const char *s, int c, size_t n)
@@ -775,3 +776,4 @@ size_t strrchrn(const char *s, int c, size_t n)
 
     return 0;
 }
+#endif

src/proto.h

@@ -205,7 +205,9 @@ size_t mbstrlen(const char *s);
 size_t nstrnlen(const char *s, size_t maxlen);
 #endif
 size_t mbstrnlen(const char *s, size_t maxlen);
+#ifndef DISABLE_TABCOMP
 size_t strrchrn(const char *s, int c, size_t n);
+#endif
 
 /* Public functions in color.c. */
 #ifdef ENABLE_COLOR