version: --build-options reports OpenSSL version information

This change uses the OpenSSL supplied OPENSSL_VERSION_TEXT #define supplied
for this purpose by that project. If the #define is not present, the version
is not reported.

Signed-off-by: Randall S. Becker <rsbecker@nexbridge.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

help.c

@@ -757,6 +757,9 @@ void get_version_info(struct strbuf *buf, int show_build_options)
 
 		if (fsmonitor_ipc__is_supported())
 			strbuf_addstr(buf, "feature: fsmonitor--daemon\n");
+#if defined OPENSSL_VERSION_TEXT
+		strbuf_addf(buf, "OpenSSL: %s\n", OPENSSL_VERSION_TEXT);
+#endif
 	}
 }