configure: Also check for libcrypto on Windows

With OpenSSL 1.1.0 the library is now named libcrypto too on Windows.
Check for libeay32 first so we don't link against the build environment's
version of OpenSSL instead of the native one that might be available.

configure.ac

@@ -842,7 +842,7 @@ AC_COMPILE_IFELSE(
 	[
 		AC_MSG_RESULT([yes])
 		windows=true
-		openssl_lib=eay32
+
 		AC_SUBST(PTHREADLIB, "")
 		# explicitly disable ms-bitfields, as it breaks __attribute__((packed))
 		case "$CFLAGS" in
@@ -852,7 +852,6 @@ AC_COMPILE_IFELSE(
 	],
 	[
 		AC_MSG_RESULT([no])
-		openssl_lib=crypto
 
 		# check for clock_gettime() on non-Windows only. Otherwise this
 		# check might find clock_gettime() in libwinpthread, but we don't want
@@ -866,7 +865,6 @@ AC_COMPILE_IFELSE(
 		LIBS=$saved_LIBS
 	]
 )
-AC_SUBST(OPENSSL_LIB, [-l$openssl_lib])
 AM_CONDITIONAL(USE_WINDOWS, [test "x$windows" = xtrue])
 
 AC_MSG_CHECKING([for working __attribute__((packed))])
@@ -1118,8 +1116,17 @@ if test x$sqlite = xtrue; then
 fi
 
 if test x$openssl = xtrue; then
-	AC_CHECK_LIB([$openssl_lib],[EVP_CIPHER_CTX_new],[LIBS="$LIBS"],
-				 [AC_MSG_ERROR([OpenSSL lib$openssl_lib not found])],[$DLLIB])
+	if test "x$windows" = xtrue; then
+		openssl_lib=eay32
+		AC_CHECK_LIB([$openssl_lib],[EVP_CIPHER_CTX_new],[LIBS="$LIBS"],
+			[AC_MSG_RESULT([no]);openssl_lib=""],[$DLLIB])
+	fi
+	if test -z "$openssl_lib"; then
+		openssl_lib=crypto
+		AC_CHECK_LIB([$openssl_lib],[EVP_CIPHER_CTX_new],[LIBS="$LIBS"],
+			[AC_MSG_ERROR([OpenSSL lib$openssl_lib not found])],[$DLLIB])
+	fi
+	AC_SUBST(OPENSSL_LIB, [-l$openssl_lib])
 	AC_CHECK_HEADER([openssl/evp.h],,[AC_MSG_ERROR([OpenSSL header openssl/evp.h not found!])])
 fi