cgraph aagerror: squash -Wmissing-prototypes warning

Calls to this function are generated by Flex – it normally generates calls to
`yyerror` but we alter the Flex prefix to `aag` – but it does not generate a
prototype for the function. So squash the compiler’s overly cautious warning:

  ../../lib/cgraph/scan.l: At top level:
  ../../lib/cgraph/scan.l:219:6: warning: no previous prototype for ‘aagerror’
    [-Wmissing-prototypes]
    219 | void aagerror(const char *str)
        |      ^~~~~~~~

diff --git a/lib/cgraph/scan.l b/lib/cgraph/scan.l
index 8dfb23a9dbc76b5d19d0e3975de52f7dcb6f0fd2..72be9b3d09c4844f4b8495168b2f670fa63f79c6 100644 (file)
--- a/lib/cgraph/scan.l
+++ b/lib/cgraph/scan.l
@@ -216,6 +216,7 @@ ID          ({NAME}|{NUMBER})
 .                                              return aagtext[0];
 %%
 
+void aagerror(const char *str);
 void aagerror(const char *str)
 {
        char    xbuf[BUFSIZ];