Revert previous change -- it was an accident.

Configure

diff --git a/Configure b/Configure
index 26f029f..30927ae 100755
--- a/Configure
+++ b/Configure
@@ -720,18 +720,6 @@
 
 	system "perl crypto/objects/obj_dat.pl <crypto/objects/objects.h >crypto/objects/obj_dat.h";
 } else {
-	open (OUT,">crypto/buildinf.h") || die "Can't open buildinf.h";
-	printf OUT <<EOF;
-#ifndef MK1MF_BUILD
-  /* auto-generated by Configure for crypto/cversion.c:
-   * for Unix builds, crypto/Makefile.ssl generates functional definitions;
-   * Windows builds (and other mk1mf builds) compile cversion.c with
-   * -DMK1MF_BUILD and use definitions added to this file by util/mk1mf.pl. */
-  #error "Windows builds (PLATFORM=$target) use mk1mf.pl-created Makefiles"
-#endif
-EOF
-	close(OUT);
-
 	(system "make -f Makefile.ssl PERL=\'$perl\' links") == 0 or exit $?;
 	### (system 'make depend') == 0 or exit $? if $depflags ne "";
 	# Run "make depend" manually if you want to be able to delete