Bump PORTREVISION in security/pinentry and pinentry-qt4 after r415872.

r415872 changed the binary name that security/pinentry-qt4 installs without
bumping PORTREVISION in the affected ports, so if security/pinentry gets
rebuilt after this change but security/pinentry-qt4 is not the pinentry symlink
will be broken. Similarly, if one builds security/pinentry-qt{4,5} without
updating security/pinentry, the pinentry symlink will also be broken.

PR: 209556
MFH: 2016Q3