Update to 0.6.22

• Update MASTER_SITES
• Use USES=localbase
• Strip shared library
• Convert to options target helper
• Update WWW
• Take maintainership

Changes: https://github.com/libexif/libexif/releases
PR: 250105
Submitted by: sunpoet (myself)
Approved by: dbaio (maintainer)
Security: cff0b2e2-0716-11eb-9e5d-08002728f74c
MFH: 2020Q4