Define PLATFORM correctly when cross-building.

secure/lib/libcrypto/Makefile

@@ -297,11 +297,11 @@ CSTD=	gnu89
 
 CLEANFILES=	buildinf.h opensslconf.h evp.h
 
-buildinf.h:
+buildinf.h: ${.CURDIR}/Makefile
 	( echo "#ifndef MK1MF_BUILD"; \
 	echo "  /* auto-generated by crypto/Makefile.ssl for crypto/cversion.c */"; \
 	echo "  #define CFLAGS \"$(CC)\""; \
-	echo "  #define PLATFORM \"`uname -s`-`uname -m`\""; \
+	echo "  #define PLATFORM \"FreeBSD-${MACHINE_ARCH}\""; \
 	echo "  #define DATE \"`LC_ALL=C date`\""; \
 	echo "#endif" ) > ${.TARGET}