Update build docs to work on OpenBSD (#14052)

Author: gpotter2

docs/installation.rst

@@ -224,8 +224,8 @@ dependencies.
     . env/bin/activate
     pip install -U setuptools
     pip install -U wheel pip
-    curl -O https://www.openssl.org/source/openssl-${OPENSSL_VERSION}.tar.gz
-    tar xvf openssl-${OPENSSL_VERSION}.tar.gz
+    curl -LO https://www.openssl.org/source/openssl-${OPENSSL_VERSION}.tar.gz
+    tar xzvf openssl-${OPENSSL_VERSION}.tar.gz
     cd openssl-${OPENSSL_VERSION}
     ./config no-shared no-ssl2 no-ssl3 -fPIC --prefix=${CWD}/openssl
     make && make install