address win32 build issues

- Replace external -DOPENSSL/-DPKCS11CRYPTO with properly AC_DEFINEd
  HAVE_OPENSSL/HAVE_PKCS11
- Don't enforce the crypto provider from platform.h, just from dst_api.c
  and configure scripts

bin/dig/Makefile.in

@@ -21,7 +21,7 @@ CINCLUDES =	-I${srcdir}/include ${DNS_INCLUDES} \
 		${BIND9_INCLUDES} ${ISC_INCLUDES} \
 		${IRS_INCLUDES} ${ISCCFG_INCLUDES} @LIBIDN2_CFLAGS@ @DST_OPENSSL_INC@
 
-CDEFINES =	-DVERSION=\"${VERSION}\" @CRYPTO@
+CDEFINES =	-DVERSION=\"${VERSION}\"
 CWARNINGS =
 
 ISCCFGLIBS =	../../lib/isccfg/libisccfg.@A@

bin/dig/dighost.c

@@ -86,7 +86,7 @@
 
 #include <dig/dig.h>
 
-#ifdef PKCS11CRYPTO
+#if HAVE_PKCS11
 #include <pk11/result.h>
 #endif
 
@@ -1340,7 +1340,7 @@ setup_libs(void) {
 
 	debug("setup_libs()");
 
-#ifdef PKCS11CRYPTO
+#if HAVE_PKCS11
 	pk11_result_register();
 #endif
 	dns_result_register();