Bump OPENSSL_VERSION_NUMBER to latest 1.0.2

Some projects (NGINX, OpenResty, ...) check for the, uhm, "alphabetic"
part of OpenSSL versions as well.

Change-Id: Iaa0809437756bc805235a1f53f4d62c900d22ca5
Reviewed-on: https://boringssl-review.googlesource.com/11440
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>

include/openssl/base.h

@@ -117,7 +117,7 @@ extern "C" {
 #define OPENSSL_IS_BORINGSSL
 #define BORINGSSL_201512
 #define BORINGSSL_201603
-#define OPENSSL_VERSION_NUMBER 0x10002000
+#define OPENSSL_VERSION_NUMBER 0x100020af
 #define SSLEAY_VERSION_NUMBER OPENSSL_VERSION_NUMBER
 
 /* BORINGSSL_API_VERSION is a positive integer that increments as BoringSSL