OpenSSL <= 1.0.2 requires gdi32 for RAND_screen(). OpenSSL >= 1.1.0 no
longer has RAND_screen() but it now requires crypt32. If pkg-config is
usable, they are automatically linked, but if it is not, configuring
Ruby/OpenSSL fails.

Fixes: https://bugs.ruby-lang.org/issues/13080

Fix for ASN1::Constructive 'each' implementation

…aint

* topic/windows-static-linking-without-pkg-config:
  Fix build with static OpenSSL libraries on Windows

The new RubyInstaller 2.3.3 uses OpenSSL 1.0.2j. This will fix CI build
on AppVayor. Note that this is not a future-proof resolution; the future
releases of RubyInstaller that AppVayor will use may require another
incompatible version of OpenSSL.

Import mu_pp method from Ruby trunk.

Commit 34e7fe3 ("Use rb_obj_class() instead of CLASS_OF()",
2016-09-08) incorrectly inverted the result. Fix it, and add a test
case for this.

Fixes: 34e7fe3 ("Use rb_obj_class() instead of CLASS_OF()")

Ruby 2.3.3/2.4.0, OpenSSL 1.0.2k/1.1.0d and LibreSSL 2.3.9/2.4.4.