wvstreams: add recipe for version 4.6.1

Recipe based on OE classic's recipe for version 4.4.1, as of
0585ccfa49f71a81652c7f63885202e952ebd0e9.

Summary of changes against OE classic's recipe:

* Apply some Debian patches from
  http://patch-tracker.debian.org/package/wvstreams/4.6.1-6

* Minor adjustments for the current build system (add
  LIC_FILES_CHKSUM, md5 and sha256 sums for SRC_URI, fix LICENSE, remove
  PR)

* Add --without-valgrind to EXTRA_OECONF

* Disable parallel make, since it was causing errors like

Log data follows:
| DEBUG: SITE files ['endian-little', 'bit-32', 'arm-common', 'common-linux', 'common-glibc', 'arm-linux', 'arm-linux-gnueabi', 'common']
| DEBUG: Executing shell function do_compile
| NOTE: make -j 8
| ./CXX -c utils/wvbuffer
| ./CXX -c utils/wvbufferstore
| ./CXX -c utils/wvcont
| /bin/bash: ./CXX: No such file or directory
| /bin/bash: ./CXX: No such file or directory
| /bin/bash: ./CXX: No such file or directory
| * Generating CC using c
| make: * Generating CXX using cc
...