patch 9.0.0271: using INIT() in non-header files

Problem:    Using INIT() in non-header files.
Solution:   Remove INIT(). (closes #10981)
diff --git a/src/ex_getln.c b/src/ex_getln.c
index 7b84af6..022c405 100644
--- a/src/ex_getln.c
+++ b/src/ex_getln.c
@@ -59,7 +59,7 @@
 #ifdef FEAT_CMDWIN
 static int	open_cmdwin(void);
 
-static int	cedit_key INIT(= -1);	// key value of 'cedit' option
+static int	cedit_key = -1;	// key value of 'cedit' option
 #endif