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>