1) Moved tprintf and related functions to their own file in common/libc/printf/tprintf.c.

This file is included by both libc and hostcompat.

2) Changed printf -> tprintf in all testbin programs

userland/lib/hostcompat/hostcompat.h

@@ -35,6 +35,13 @@ void hostcompat_init(int argc, char **argv);
 
 time_t __time(time_t *secs, unsigned long *nsecs);
 
+/* Automated testing extensions. */
+
+int tprintf(const char *fmt, ...);
+int nprintf(const char *fmt, ...);
+int printsf(const char *fmt, ...);
+
+
 #ifdef DECLARE_NTOHLL
 uint64_t ntohll(uint64_t);
 #define htonll(x) (ntohll(x))