pkgtools/pkglint: update to 5.7.2

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.

1 files changed, 3 insertions, 0 deletions

diff --git a/pkgtools/pkglint/files/textproc/lexer.go b/pkgtools/pkglint/files/textproc/lexer.go
index 3d22338be95..9687e101bb2 100644
--- a/pkgtools/pkglint/files/textproc/lexer.go
+++ b/pkgtools/pkglint/files/textproc/lexer.go
@@ -226,6 +226,9 @@ func (l *Lexer) Copy() *Lexer { return &Lexer{l.rest} }
 func (l *Lexer) Commit(other *Lexer) bool { l.rest = other.rest; return true }
 
 // NewByteSet creates a bit mask out of a string like "0-9A-Za-z_".
+// To add an actual hyphen to the bit mask, write it as "---"
+// (a range from hyphen to hyphen).
+//
 // The bit mask can be used with Lexer.NextBytesSet.
 func NewByteSet(chars string) *ByteSet {
 	var set ByteSet