[depends] update openssl to 1.0.2r

- This addresses https://www.openssl.org/news/secadv/20190226.txt (CVE: 2019-1559) which impacted all versions of openssl-1.0.

Note that this does not address CVE-2019-1543 (https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-1543), which impacts all versions of openssl 1.1 through 1.1.0j and 1.1.1b.

The above (1.1) is patched in openssl, where it was marked as low severity.  Similar issues possibly present in monero, should be looked into w.r.t. CVE-2019-1543.

contrib/depends/packages/openssl.mk

@@ -1,8 +1,8 @@
 package=openssl
-$(package)_version=1.0.2q
+$(package)_version=1.0.2r
 $(package)_download_path=https://www.openssl.org/source
 $(package)_file_name=$(package)-$($(package)_version).tar.gz
-$(package)_sha256_hash=5744cfcbcec2b1b48629f7354203bc1e5e9b5466998bbccc5b5fcde3b18eb684
+$(package)_sha256_hash=ae51d08bba8a83958e894946f15303ff894d75c2b8bbd44a852b64e3fe11d0d6
 
 define $(package)_set_vars
 $(package)_config_env=AR="$($(package)_ar)" RANLIB="$($(package)_ranlib)" CC="$($(package)_cc)"