Log Message:
Upgrade to 20200601

* Update Mozilla certificate authority bundle to version 2.40.
* Add distrusted Symantec CA list to blacklist for explicit removal.
* Blacklist expired root certificate, "AddTrust External Root".

The following certificate authorities were added (+):
+ "Certigna Root CA"
+ "emSign ECC Root CA - C3"
+ "emSign ECC Root CA - G3"
+ "emSign Root CA - C1"
+ "emSign Root CA - G1"
+ "Entrust Root Certification Authority - G4"
+ "GTS Root R1"
+ "GTS Root R2"
+ "GTS Root R3"
+ "GTS Root R4"
+ "Hongkong Post Root CA 3"
+ "UCA Extended Validation Root"
+ "UCA Global G2 Root"

The following certificate authorities were removed (-):
- "AddTrust External Root"
- "Certinomis - Root CA"
- "Certplus Class 2 Primary CA"
- "Deutsche Telekom Root CA 2"
- "GeoTrust Global CA"
- "GeoTrust Primary Certification Authority"
- "GeoTrust Primary Certification Authority - G2"
- "GeoTrust Primary Certification Authority - G3"
- "GeoTrust Universal CA"
- "thawte Primary Root CA"
- "thawte Primary Root CA - G2"
- "thawte Primary Root CA - G3"
- "VeriSign Class 3 Public Primary Certification Authority - G4"
- "VeriSign Class 3 Public Primary Certification Authority - G5"
- "VeriSign Universal Root Certification Authority"

Changes for pkgsrc packaging:
* Add README.pkgsrc, replacing MESSAGE.
* Improve DESCR to better describe the functionality of the package.
* Install changelog and README.source from the distribution package.