Added tests for some stdio functions.

Cython/Includes/libc/stdio.pxd

@@ -20,7 +20,7 @@ cdef extern from "stdio.h" nogil:
     int  fclose   (FILE *stream)
     int  remove   (const char *filename)
     int  rename   (const char *oldname, const char *newname)
-    FILE *tmpfile (void)
+    FILE *tmpfile ()
 
     int remove (const char *pathname)
     int rename (const char *oldpath, const char *newpath)
@@ -66,7 +66,7 @@ cdef extern from "stdio.h" nogil:
 
     char *gets  (char *s)
     char *fgets (char *s, int count, FILE *stream)
-    int getchar (void)
+    int getchar ()
     int fgetc   (FILE *stream)
     int getc    (FILE *stream)
     int ungetc  (int c, FILE *stream)

tests/compile/libc_all.pyx

@@ -36,6 +36,3 @@ from libc.stdio  cimport *
 from libc.stdlib cimport *
 from libc.string cimport *
 
-libc.stdio.printf("hello %s\n", b"world")
-stdio.printf("hello %s\n", b"world")
-printf("hello %s\n", b"world")

tests/compile/libc_stdio.pyx

+# mode: compile
+
+cimport libc
+from libc cimport stdio
+from libc.stdio cimport printf, puts, fputs, putchar, fputc, putc, stdout
+
+
+libc.stdio.printf("hello %s\n", b"world")
+stdio.printf("hello %s\n", b"world")
+printf("hello %s\n", b"world")
+printf("printf_output %d %d\n", 1, 2)
+puts("puts_output")
+fputs("fputs_output", stdout)
+putchar(b'z')
+fputc(b'x', stdout)
+putc(b'c', stdout)