Windows portability fixes

Windows needs strsep() and defines a P_WAIT constant that we
need to undefine.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

configure.in

@@ -129,6 +129,7 @@ AC_CHECK_FUNCS(strspn, ,
 
 AC_CHECK_FUNCS(strcasecmp stricmp)
 AC_CHECK_FUNCS(strncasecmp strnicmp)
+AC_CHECK_FUNCS(strsep)
 
 AC_CHECK_FUNCS(getuid)
 AC_CHECK_FUNCS(getgid)
@@ -153,7 +154,6 @@ AC_SUBST([LIBOBJDIR], [lib/])
 PA_REPLACE_FUNC([vsnprintf _vsnprintf])
 PA_REPLACE_FUNC([snprintf _snprintf])
 PA_REPLACE_FUNC([strlcpy])
-PA_REPLACE_FUNC([strsep])
 
 dnl Check for functions that might not be declared in the headers for
 dnl various idiotic reasons (mostly because of library authors

nasm.h

@@ -479,6 +479,10 @@ enum vex_class {
  * prefixes, we must ensure the enumerations for prefixes and
  * register names do not overlap.
  */
+#ifdef P_WAIT
+# undef P_WAIT			/* Macro defined on some Windows versions */
+#endif
+
 enum prefixes { /* instruction prefixes */
     P_none = 0,
     PREFIX_ENUM_START = REG_ENUM_LIMIT,