Log message:
multimedia/libmpeg2: fix build on NetBSD/macppc.

This re-orders the two tests for altivec to first try with
<altivec.h> included, and the second without.

The configure script is hand-patched, corresponding to configure.ac;
I could not generate a working configure script...

Log message:
*: remove pkg-config from tools where no buildlink3.mk file is included

Bulk build on NetBSD of these packages had the same result as before
(build succeeds, no PLIST change).

Log message:
multimedia: Replace RMD160 checksums with BLAKE2s checksums

All checksums have been double-checked against existing RMD160 and
SHA512 hashes

The following distfiles could not be fetched (for legal reasons?):

./multimedia/adobe-flash-player/distinfo \ 
adobe-flash-player-32.0.0.465/flash_player_npapi_linux.i386.tar.gz
./multimedia/adobe-flash-player/distinfo \ 
adobe-flash-player-32.0.0.465/flash_player_npapi_linux.x86_64.tar.gz
./multimedia/libdvdcss/distinfo libdvdcss-1.4.3.tar.bz2

Log message:
multimedia: Remove SHA1 hashes for distfiles

Log message:
*: Convert broken sourceforge HOMEPAGEs back to http

Log message:
all: migrate several HOMEPAGEs to https

pkglint --only "https instead of http" -r -F

With manual adjustments afterwards since pkglint 19.4.4 fixed a few
indentations in unrelated lines.

This mainly affects projects hosted at SourceForce, as well as
freedesktop.org, CTAN and GNU.

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:
Use OPSYSVARS.