Use gcc -ansi -pedantic in 9c. Fix many non-C89-isms.

src/cmd/astro/venust.c

@@ -27,7 +27,7 @@ double	venfp[]	=
 	0.717e-6,	2.2969,
 	2.991e-6,	2.0611,
 	1.335e-6,	0.9628,
-	0.,
+	0.
 };
 
 char	vencp[]	=
@@ -56,5 +56,5 @@ char	vencp[]	=
 	4,-5,0,0,
 	2,0,-3,0,
 	1,0,0,-1,
-	2,0,0,-2,
+	2,0,0,-2
 };