patch 8.1.0730: compiler warning for get_buf_arg() unused

Problem:    Compiler warning for get_buf_arg() unused.
Solution:   Add #ifdef. (John Marriott)
diff --git a/src/evalfunc.c b/src/evalfunc.c
index a9a92d2..3f8e615 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -1919,6 +1919,7 @@
     return buf;
 }
 
+#ifdef FEAT_SIGNS
 /*
  * Get the buffer from "arg" and give an error and return NULL if it is not
  * valid.
@@ -1935,6 +1936,7 @@
 	EMSG2(_("E158: Invalid buffer name: %s"), tv_get_string(arg));
     return buf;
 }
+#endif
 
 /*
  * "bufname(expr)" function
diff --git a/src/version.c b/src/version.c
index 118a867..7aeaa48 100644
--- a/src/version.c
+++ b/src/version.c
@@ -796,6 +796,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    730,
+/**/
     729,
 /**/
     728,