patch 9.0.0054: compiler warning for size_t to int conversion

Problem:    Compiler warning for size_t to int conversion.
Solution:   Add type cast. (Mike Williams, closes #10741)
diff --git a/src/insexpand.c b/src/insexpand.c
index 9c598a8..b49a631 100644
--- a/src/insexpand.c
+++ b/src/insexpand.c
@@ -643,7 +643,7 @@
 	    if (ga_grow(&gap, IOSIZE) == FAIL)
 		return (char_u *)"[failed]";
 	    STRCPY(gap.ga_data, IObuff);
-	    gap.ga_len = STRLEN(IObuff);
+	    gap.ga_len = (int)STRLEN(IObuff);
 	}
 	else if (has_mbyte)
 	    p += (*mb_char2bytes)(wca[i++], p);
diff --git a/src/version.c b/src/version.c
index 9e7a988..8ea00e2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -736,6 +736,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    54,
+/**/
     53,
 /**/
     52,