Use __NBSD_LIBC to specialize common headers for NetBSD headers compilation.

This patch contains the required changes (under __NBSD_LIBC definition) of the common headers to compile the NetBSD libc.

common/include/minix/ansi.h

@@ -69,8 +69,10 @@
 #define _POSIX_SOURCE	1
 #endif
 
+#ifndef __NBSD_LIBC
 /* What is a va_list? */
 #include <stdarg.h>
 #define _BSD_VA_LIST_ va_list
+#endif /* !__NBSD_LIBC */
 
 #endif /* _MINIX_ANSI_H */

common/include/termios.h

@@ -74,6 +74,9 @@ struct termios {
 #define VSTART               9	/* cc_c[VSTART] = START char (^S) */
 #define VSTOP               10	/* cc_c[VSTOP] = STOP char (^Q) */
 
+#ifdef __NBSD_LIBC
+/* This is defined in <unistd.h> in NetBSD headers.
+#else /* !__NBSD_LIBC */
 #define _POSIX_VDISABLE	  (cc_t)0xFF	/* You can't even generate this 
 					 * character with 'normal' keyboards.
 					 * But some language specific keyboards
@@ -81,6 +84,7 @@ struct termios {
 					 * 256 are used, so cc_t should be a
 					 * short...
 					 */
+#endif /* !__NBSD_LIBC */
 
 /* Values for the baud rate settings.  POSIX Table 7-6. */
 #define B0		0x0000	/* hang up the line */