gnu: rustc: Fix process test.

* gnu/packages/rust.scm (rustc)[arguments]: Rename 'patch-lockfile-test
to 'patch-tests.  Add another substitution.

gnu: Add maxflow.

* gnu/packages/maths.scm (maxflow): New variable.

gnu: Add itpp.

* gnu/packages/maths.scm (itpp): New variable.

gnu: emacs-slime: Update to 2.19.

* gnu/packages/emacs.scm (emacs-slime): Update to 2.19.

gnu: ocaml-qtest: Update to 2.5.

* gnu/packages/ocaml.scm (ocaml-qtest): Update to 2.5.

doc: Make "Application Setup" slightly more visible.

Suggested by Arne Babenhauserheide.

* doc/guix.texi (Binary Installation): Make the "Application Setup"
reference an 8th item in the list.

http-client: Avoid name clash with 'open-connection-for-uri' in 2.2.0.

* guix/build/download.scm (open-connection-for-uri): Add note about
same-named binding in Guile 2.2.0.
* guix/http-client.scm: Use 'guix:open-connection-for-uri' for the
procedure coming from (guix build download).
* guix/scripts/lint.scm: Likewise.
* guix/scripts/substitute.scm: Likewise.

build: Require Guile >= 2.0.9.

* configure.ac: Bump requirement to 2.0.9.
* doc/guix.texi (Requirements): Adjust accordingly.
* README (Requirements): Likewise.
* build-aux/download.scm: Remove workaround for <http://bugs.gnu.org/13095>.
* guix/build/download.scm: Likewise.
(http-fetch)[post-2.0.7?]: Remove.  Remove conditional code for not
POST-2.0.7?.
* guix/http-client.scm:  Remove workaround for <http://bugs.gnu.org/13095>.
(http-fetch)[post-2.0.7?]: Remove.  Remove conditional code for not
POST-2.0.7?.
* guix/serialization.scm (read-latin1-string): Remove mention of 2.0.9.
* tests/nar.scm: Use (ice-9 control).
(let/ec): Remove.

pack: Add '--target'.

* guix/scripts/pack.scm (self-contained-tarball): Add #:target.
(docker-image): Add #:target.
[build]: Pass it to 'build-docker-image'.
(%options, show-help): Add '--target'.
(guix-pack): Pass TARGET to 'profile-derivation' and to 'build-image'.
* guix/docker.scm (build-docker-image): Add #:system parameter and honor it.
* doc/guix.texi (Invoking guix pack): Document '--target'.
(Additional Build Options): Refer to the Autoconf manual instead of the
obsolete 'configure.info' for cross-compilation.

profiles: Packages in a profile can be cross-compiled.

* guix/profiles.scm (profile-derivation): Add #:target parameter; pass
it to 'gexp->derivation'.
* tests/profiles.scm ("profile-derivation, cross-compilation"): New test.

pack: Move absolute file name to <compressor>.

* guix/scripts/pack.scm (<compressor>)[package]: Remove.
[command]: Document as being a gexp with an absolute file name.
(%compressors): Adjust accordingly.
(self-contained-tarball): Simplify PATH expression.  Move 'string-join'
for the compressor command on the build side.
(docker-image): Simplify PATH expression.
* tests/pack.scm (%gzip-compressor): Adjust accordingly.

gnu: libbluray: Update to 1.0.0.

* gnu/packages/video.scm (libbluray): Update to 1.0.0.

gnu: libx264: Update to 20170316-2245.

* gnu/packages/video.scm (libx264): Update to 20170316-2245.

gnu: libwebp: Update to 0.6.0.

* gnu/packages/image.scm (libwebp): Update to 0.6.0.
[source]: Remove patch.
* gnu/packages/patches/libwebp-CVE-2016-9085.patch: Delete file.
* gnu/local.mk (dist_patch_DATA): Remove it.

gnu: ninja: Update to 1.7.2.

* gnu/packages/ninja.scm (ninja): Update to 1.7.2.
[source]: Remove patch.
* gnu/packages/patches/ninja-tests.patch: Delete file.
* gnu/local.mk (dist_patch_DATA): Remove it.

gnu: btrfs-progs: Use @dfn in description.

* gnu/packages/linux.scm (btrfs-progs)[description]: Use @dfn.

gnu: btrfs-progs: Update to 4.10.1.

* gnu/packages/linux.scm (btrfs-progs): Update to 4.10.1.

build/cargo-build-system: Make cargo-build-system install working packages.

* guix/build/cargo-build-system.scm (configure): Remove proprietary
dependencies. Add rust dependencies and configure Cargo to find them.
(build): Also build libraries, not just applications.
(file-sha256): New variable.
(generate-checksums): New variable. Export it.
(touch): New variable.
(install): Generate checksums so Cargo accepts the package.

build-system/cargo (cargo-build): Add cargo-build-flags, remove configure-flags.

* guix/build-system/cargo.scm (cargo-build): Add cargo-build-flags,
remove configure-flags.

gnu: cargo: Use upstream cargo.

* gnu/packages/rust.scm (cargo): Use upstream cargo.