openssl: Updated certdata.txt and mk-ca-bundle.pl

Changes made to mk-ca-bundle.pl from upstream's version:
- Removed hard dependency on LWP::UserAgent because this module isn't present by default. This module is only needed if the script needs to download certdata.txt, but we don't want it to do that in the first place.
- Changed the output filename from ca-bundle.crt to cert.pem
- Removed calls to functions that calculate the SHA1 of the output file using openssl. This is only needed if the output file doesn't already exist, which we know it doesn't.
build.ps1: openssl: The first nmake doesn't fail any more.
build.ps1: libxml2: Removed call to runsuite.exe. It's not built.