Merge branch 'master' into core-updates

build: Add minify build system.

* guix/build-system/minify.scm: New file.
* guix/build/minify-build-system: New file.
* Makefile.am (MODULES): Add new files.
* doc/guix.texi (Build Systems): Document minify-build-system.

build: Make Guile-Git a hard requirement.

* configure.ac: Error out when (git) is missing.
* doc/guix.texi (Requirements): Mention Guile-Git.
* Makefile.am (MODULES): Add guix/git.scm unconditionally.

Merge branch 'master' into core-updates

Add 'guix weather'.

* guix/scripts/weather.scm: New file.
* Makefile.am (MODULES): Add it.
* doc/guix.texi (Substitutes, Invoking guix publish): Mention "guix
weather".
(Invoking guix weather): New node.

Co-authored-by: Ricardo Wurmus <rekado@elephly.net>

Merge branch 'master' into core-updates

gnu: linux-libre: Update to 4.12.

* gnu/packages/linux.scm (%linux-libre-version): Update to 4.12.
(%linux-libre-hash): Update hash.
* gnu/packages/aux-files/linux-libre/4.11-i686.conf,
gnu/packages/aux-files/linux-libre/4.11-x86_64.conf: Delete files.
* gnu/packages/aux-files/linux-libre/4.12-i686.conf,
gnu/packages/aux-files/linux-libre/4.12-x86_64.conf: New files.
* Makefile.am (AUX_FILES): Update accordingly.

Merge branch 'master' into core-updates

maint: Disk image size is automatically guessed.

* Makefile.am (GUIXSD_VM_IMAGE_SIZE): Remove.
(release): Remove --image-size argument from 'guix system disk-image'
command.

build: Remove check for broken (srfi srfi-37).

This was for Guile < 2.0.9 and we've been requiring 2.0.9+ for some time
already.

* configure.ac: Remove 'GUIX_CHECK_SRFI_37' use and 'INSTALL_SRFI_37'
conditional.
* Makefile.am: Remove code in "if INSTALL_SRFI_37".
(EXTRA_DIST): Remove srfi/srfi-37.scm.in.
* srfi/srfi-37.scm.in: Remove.
* m4/guix.m4 (GUIX_CHECK_SRFI_37): Remove.

Merge branch 'master' into core-updates

guix: Add texlive importer.

* guix/import/texlive.scm: New file.
* guix/scripts/import/texlive.scm: New file.
* Makefile.am (MODULES): Add them.
* tests/texlive.scm: New file.
* Makefile.am (SCM_TESTS): Add it.
* guix/scripts/import.scm (importers): Add texlive importer.
* doc/guix.texi (Invoking guix import): Document it.

build-system: Add 'texlive-build-system'.

* guix/build-system/texlive.scm: New file.
* guix/build/texlive-build-system.scm: New file.
* Makefile.am (MODULES): Add them.
* doc/guix.texi (Build Systems): Document it.
* gnu/packages/tex.scm (%texlive-tag, %texlive-revision): Remove variables.
(texlife-ref): Remove procedure.

Merge branch 'master' into core-updates

guix: git: Add new module.

* guix/git.scm: New file.
* configure.ac: Check for (guile git).
* Makefile.am: Build guix/git.scm if (guile git) is available.

Merge branch 'master' into core-updates

 Conflicts:
	gnu/packages/image.scm
        (incorporated libtiff graft)

Merge branch 'master' into staging

build-system: Add 'font-build-system'.

* Makefile.am (MODULES): Add 'guix/build-system/font.scm' and
  'guix/build/font-build-system.scm'.
* guix/build-system/font.scm: New file.
* guix/build/font-build-system.scm: New file.
* doc/guix.texi (Build Systems): Add 'font-build-system'.

Merge branch 'master' into staging

Merge branch 'master' into core-updates