patch 8.2.2813: cannot grep using fuzzy matching

Problem:    Cannot grep using fuzzy matching.
Solution:   Add the "f" flag to :vimgrep. (Yegappan Lakshmanan, closes #8152)
diff --git a/src/ex_cmds.c b/src/ex_cmds.c
index 96ff6ec..06109d5 100644
--- a/src/ex_cmds.c
+++ b/src/ex_cmds.c
@@ -5288,14 +5288,16 @@
 	++p;
 
 	// Find the flags
-	while (*p == 'g' || *p == 'j')
+	while (*p == 'g' || *p == 'j' || *p == 'f')
 	{
 	    if (flags != NULL)
 	    {
 		if (*p == 'g')
 		    *flags |= VGR_GLOBAL;
-		else
+		else if (*p == 'j')
 		    *flags |= VGR_NOJUMP;
+		else
+		    *flags |= VGR_FUZZY;
 	    }
 	    ++p;
 	}