Auto merge of #2533 - devnexen:win32_stdio_more, r=JohnTitor

windows add printf/fprintf

close #2241

Author: bors

libc-test/semver/windows.txt

@@ -199,6 +199,7 @@ fgets
 fileno
 fopen
 fpos_t
+fprintf
 fputc
 fputs
 fread
@@ -257,6 +258,7 @@ pclose
 perror
 pipe
 popen
+printf
 ptrdiff_t
 putchar
 puts

src/windows/mod.rs

@@ -319,6 +319,8 @@ extern "C" {
     pub fn feof(stream: *mut FILE) -> c_int;
     pub fn ferror(stream: *mut FILE) -> c_int;
     pub fn perror(s: *const c_char);
+    pub fn printf(format: *const c_char, ...) -> ::c_int;
+    pub fn fprintf(stream: *mut FILE, format: *const c_char, ...) -> ::c_int;
     pub fn atoi(s: *const c_char) -> c_int;
     pub fn strtod(s: *const c_char, endp: *mut *mut c_char) -> c_double;
     pub fn strtof(s: *const c_char, endp: *mut *mut c_char) -> c_float;