Build variadic functions as part of relibc

include/bits/stdio.h

@@ -1,40 +1,9 @@
 #ifndef _BITS_STDIO_H
 #define _BITS_STDIO_H
 
-int fprintf(FILE * stream, const char * fmt, ...) {
-    int ret;
-    va_list ap;
-    va_start(ap, fmt);
-    ret = vfprintf(stream, fmt, ap);
-    va_end(ap);
-    return ret;
-}
-
-int printf(const char * fmt, ...) {
-    int ret;
-    va_list ap;
-    va_start(ap, fmt);
-    ret = vprintf(fmt, ap);
-    va_end(ap);
-    return ret;
-}
-
-int snprintf(char *s, size_t n, const char * fmt, ...) {
-    int ret;
-    va_list ap;
-    va_start(ap, fmt);
-    ret = vsnprintf(s, n, fmt, ap);
-    va_end(ap);
-    return ret;
-}
-
-int sprintf(char *s, const char * fmt, ...) {
-    int ret;
-    va_list ap;
-    va_start(ap, fmt);
-    ret = vsprintf(s, fmt, ap);
-    va_end(ap);
-    return ret;
-}
+int fprintf(FILE * stream, const char * fmt, ...);
+int printf(const char * fmt, ...);
+int snprintf(char *s, size_t n, const char * fmt, ...);
+int sprintf(char *s, const char * fmt, ...);
 
 #endif /* _BITS_STDIO_H */