Update OpenSSL requirement in INSTALL too

This should've been part of commit
200c91f.

(cherry picked from commit d97ce26)

INSTALL

@@ -50,7 +50,7 @@ but it is considered insecure and it's use is strongly discouraged:
 
 libgcrypt library is available from https://www.gnupg.org/software/libgcrypt/
 
-If using the OpenSSL library for encryption, it must be version 3.0.0 or
+If using the OpenSSL library for encryption, it must be version 1.0.2 or
 later. Note: when compiling against OpenSSL, there is a possible license
 incompatibility. For more details on this, see
 https://people.gnome.org/~markmc/openssl-and-the-gpl.html