Removed printsf, an unused secure testing printf variant. This variant does not apply now that each test has its own secret.

Fixed unused variable in libtest161 in kernel compiles.

userland/include/stdio.h

@@ -60,7 +60,6 @@ int vsnprintf(char *buf, size_t len, const char *fmt, __va_list ap);
 
 int tprintf(const char *fmt, ...);
 int nprintf(const char *fmt, ...);
-int printsf(const char *fmt, ...);
 
 /* Print the argument string and then a newline. Returns 0 or -1 on error. */
 int puts(const char *);

userland/lib/hostcompat/hostcompat.h

@@ -39,8 +39,6 @@ time_t __time(time_t *secs, unsigned long *nsecs);
 
 int tprintf(const char *fmt, ...);
 int nprintf(const char *fmt, ...);
-int printsf(const char *fmt, ...);
-
 
 #ifdef DECLARE_NTOHLL
 uint64_t ntohll(uint64_t);