Log Message:
jq: Update devel/jq to 1.6

pkgsrc changes:
 - Use GITHUB_RELEASE instead of GITHUB_TAG because the former does not need
   auto* tools (despite we need auto* tools for patches/, hopefully one day they
   will be applied!)
 - Remove no longer needed SUBST_*, `git describe' is no longer used
 - Remove patch-src_jv__parse.c and patch-src_jv__print.c, they are
   present in 1.6
 - Rename and readjust patch-Makefile.in to patch-Makefile.am
   (pre-configure target rewrote it due `autoreconf')

Changes:
1.6
---
New in this release since 1.5:
- Destructuring Alternation
- New Builtins:
   * builtins/0
   * stderr/0
   * halt/0, halt_error/1
   * isempty/1
   * walk/1
   * utf8bytelength/1
   * localtime/0, strflocaltime/1
   * SQL-style builtins
   * and more!
- Add support for ASAN and UBSAN
- Make it easier to use jq with shebangs (8f6f28c)
- Add $ENV builtin variable to access environment
- Add JQ_COLORS env var for configuring the output colors

Bug fixes:
- Calling jq without a program argument now always assumes . for the program,
  regardless of stdin/stdout. (5fe0536)
- Make sorting stable regardless of qsort. (7835a72)
- Adds a local oniguruma submodule and the
  `./configure --with-oniguruma=builtin' option to make it easier to build
  with oniguruma support on systems where you can't install system-level
  libraries. (c6374b6 and 02bad4b)
- And much more!