sysutils/uefi-edk2-qemu: update to edk2-stable201911

Update sysutils/uefi-edk2-qemu to the TianoCore EDK2 edk2-stable201911
release.

Update python dependency to no longer use the obsolete python 2.7, but
instead require python 3.4 or newer.

Remove the openssl patch, since it's no longer needed.

Reviewed by: araujo, mikael
Approved by: araujo
Differential Revision: https://reviews.freebsd.org/D23466