Fix build with -Werror=implicit-int

https://bugs.gentoo.org/880999

--- a/asa.c
+++ b/asa.c
@@ -201,7 +201,7 @@
 copy_file(FILE *fp)
 {
     str line;
-    static first_line = 1;
+    static int first_line = 1;
 
     while ((line.len=readline(fp, &(line.chr))))
     {