ports-mgmt/portmaster: update to version 3.32

Changes in version 3.31:

Avoid use of -D due to an incompatbility with GNU make

Ports commit 755d190db121 by tijl (Tijl Coosemans) added a patch that
changed all uses of -DMACRO to MACRO=1 on make command lines, since
the MAKEFLAGS environment variable is passed to both BSD make and GNU
make (where selected) and the latter does not accept the -D option.

Changes in version 3.32:

Add -q option to --clean-distfiles
Fix small issues in the man page.