Log message:
extend PYTHON_VERSIONS_ for Python 3.7

Log message:
revbump for boost-libs update

Log message:
Revbump for packages depending on devel/libusb{,compat}

Log message:
Import global switch for libusb's implementation [2/2]

This switch is meant to be used by packages requiring an implementation of the
former libusb (as in devel/libusb). The original implementation can be
chosen by setting LIBUSB_TYPE to "native".

The alternative implementation libusb-compat (as in devel/libusb-compat) wraps
libusb1 (in devel/libusb1). This implementation can be chosen by setting
LIBUSB_TYPE to "compat". On NetBSD, it has the advantage of not \ 
requiring root
privileges to locate and use USB devices without a kernel driver.

This second part switches packages using libusb to this framework. It does not
change compilation options or dependencies at this point.

Compile-tested on most packages affected and available on NetBSD/amd64.

Log message:
Fix indentation in buildlink3.mk files.

The actual fix as been done by "pkglint -F */*/buildlink3.mk", and was
reviewed manually.

There are some .include lines that still are indented with zero spaces
although the surrounding .if is indented. This is existing practice.

Log message:
Revbump after boost update

Log message:
Replaced $(ROUND) with ${CURLY} variable references.

This has been a pkglint warning for several years now, and pkglint can even
fix it automatically. And it did for this commit.

Only in lang/mercury, two passes of autofixing were necessary because there
were nested variables.

Log message:
Revbump for boost update

Log message:
Follow some http redirects.

Log message:
Recursive revbump from boost update