Changes since 5.7.1:
* Fixed detection of GNU_CONFIGURE=yes combined with USE_LANGUAGES
missing c. This combination tends to fail in the configure phase.
* When the distinfo doesn't contain all hashes for the downloaded
distfiles (typically SHA512 is missing) and the distfiles are actually
downloaded to ${PKGSRCDIR}/distfiles, pkglint can now add the missing
hashes. It only does this if there is at least one existing hash
and if all existing hashes are correct.
* The check for redundant variables has been improved considerably.
Before there were several situations in which pkglint didn't get the
redundant variable definitions right because its internal model only
mimicked reality. The model has been improved and so have the
diagnostics.
* Pkglint only warns about wrong permissions (for defining or using
a variable) when it knows the type of the variable and the permissions
for the current file. Before, it had also warned if the permissions
for the current file were not explicitly defined.
* CFLAGS and LDFLAGS may be appended in buildlink3.mk files. This
had been disallowed before, for no apparent reason. There are several
places in pkgsrc where especially CFLAGS.${OPSYS} is appended to.
* Cleaned up internal handling of relative paths. Previously pkglint
sometimes resolved relative paths using the wrong base directory,
which led to all kinds of wrong warnings and strange behavior.
* Fixed lots of edge cases when parsing Makefile lines. These cases
don't occur often but experience tells that the most fundamental code
must be as correct as possible (see the handling of relative paths
above).
* Lots of refactoring and housekeeping, as always.
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