Make sure the sigaction structure and fileno function are properly declared...

Make sure the sigaction structure and fileno function are properly declared with an ANSI compiler on Solaris (and possibly others).

crypto/ui/ui_openssl.c

@@ -117,6 +117,13 @@
 
 #include <openssl/e_os2.h>
 
+#define _POSIX_C_SOURCE 1
+#include <signal.h>
+#include <stdio.h>
+#undef _POSIX_C_SOURCE
+#include <string.h>
+#include <errno.h>
+
 #if !defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_VMS)
 # ifdef OPENSSL_UNISTD
 #  include OPENSSL_UNISTD
@@ -145,10 +152,6 @@
 /* 06-Apr-92 Luke Brennan    Support for VMS */
 #include "ui_locl.h"
 #include "cryptlib.h"
-#include <signal.h>
-#include <stdio.h>
-#include <string.h>
-#include <errno.h>
 
 #ifdef OPENSSL_SYS_VMS		/* prototypes for sys$whatever */
 # include <starlet.h>
@@ -476,7 +479,7 @@ static int open_console(UI *ui)
 #endif
 
 #if defined(TTY_get) && !defined(OPENSSL_SYS_VMS)
-	if (TTY_get(fileno(tty_in),&tty_orig) == -1)
+ 	if (TTY_get(fileno(tty_in),&tty_orig) == -1)
 		{
 #ifdef ENOTTY
 		if (errno == ENOTTY)