gnu: perl-gd: Update to 2.68.

* gnu/packages/gd.scm (perl-gd): Update to 2.68.
[source]: Remove obsolete patch.
[native-inputs]: Remove perl-module-build.
[inputs]: Use canonical package names and order alphabetically.
[arguments]: Replace #:module-build-flags with fewer #:make-maker-flags,
enable #:tests?, and remove ‘clear-autogenerated-files’ phase.
* gnu/packages/patches/perl-gd-options-passthrough-and-fontconfig.patch: Delete file.
* gnu/local.mk (dist_patch_DATA): Remove it.

gnu: xfburn: Update to 0.5.5.

* gnu/packages/xfce.scm (xfburn): Update to 0.5.5.

gnu: phonon: Update to 4.10.0.

* gnu/packages/kde-frameworks.scm (phonon): Update to 4.10.0.

gnu: soxr: Update to 0.1.3.

* gnu/packages/audio.scm (soxr): Update to 0.1.3.

gnu: fluidsynth: Update to 1.1.10.

* gnu/packages/audio.scm (fluidsynth): Update to 1.1.10.

gnu: youtube-dl: Update to 2018.02.26.

* gnu/packages/video.scm (youtube-dl): Update to 2018.02.26.

gnu: thermald: Update to 1.7.1.

* gnu/packages/admin.scm (thermald): Update to 1.7.1.
[arguments]: Substitute INVOKE for SYSTEM* and end phase with #t.

gnu: gcab: Update to 1.1.

* gnu/packages/package-management.scm (gcab): Update to 1.1.
[source]: Remove git dependency in a snippet.

gnu: mbedtls-apache: Fix upstream typo.

A typo was introduced in version 2.7.0 that caused the hiawatha package to
fail to build. See https://github.com/ARMmbed/mbedtls/pull/1362.

* gnu/packages/tls.scm (mbedtls-apache)[source]: Add snippet to fix typo.

gnu: polkit: Fix 'invoke' call.

* gnu/packages/polkit.scm (polkit)[arguments] <'install>: Add 'apply'.
Fixes a regression introduced in 3c4bbb4c52418c8daf8b0e4605e3912685c9f44a.

gnu: commencement: Add commentary regarding grafts.

* gnu/packages/commencement.scm: Add comments that were originally
  included only in the Git commit message of
  f00b85ff8d34df0a1879e593d4a85629b8586af7.

Co-Authored-By: Ludovic Courtès <ludo@gnu.org>

gnu: linux-libre: Update to 4.15.6.

* gnu/packages/linux.scm (%linux-libre-version): Update to 4.15.6.
(%linux-libre-hash): Update hash.

gnu: linux-libre@4.14: Update to 4.14.22.

* gnu/packages/linux.scm (%linux-libre-4.14-version): Update to 4.14.22.
(%linux-libre-4.14-hash): Update hash.

gnu: linux-libre@4.9: Update to 4.9.84.

* gnu/packages/linux.scm (linux-libre-4.9): Update to 4.9.84.

gnu: linux-libre@4.4: Update to 4.4.118.

* gnu/packages/linux.scm (linux-libre-4.4): Update to 4.4.118.

gnu: emacs-org, emacs-org-contrib: Update to 20180226

* gnu/packages/emacs.scm (emacs-org):
(emacs-org-contrib): Update to 20180226, aka Org 9.1.7.

gnu: Add go@1.10.

Building Go 1.10 with the Go 1.4 bootstrap, Thread Sanitizer from GCC 5
finds a data race during the the test suite of Go 1.10. With GCC 6, the
race doesn't seem to be present.

.##### ../misc/cgo/testsanitizers
--- FAIL: TestShared (0.03s)
    --- FAIL: TestShared/tsan_shared (2.54s)
        cshared_test.go:71: `/tmp/guix-build-go-1.10.drv-0/TestShared367937240/tsan_shared` exited with exit status 66
                ==================
                WARNING: ThreadSanitizer: data race (pid=28778)
                  Write of size 8 at 0x7ffff5495c30 by thread T1:
                    #0 pthread_attr_getstacksize <null> (tsan_shared+0x00000041be82)
                    #1 x_cgo_init <null> (libtsan_shared.so+0x00000008aeaf)
                    #2 runtime.rt0_go /tmp/guix-build-go-1.10.drv-0/go/src/runtime/asm_amd64.s:199 (libtsan_shared.so+0x000000081586)

                  Previous write of size 8 at 0x7ffff5495c30 by main thread:
                    #0 <null> <null> (0x000000000001)

                  Location is stack of thread T1.

                  Thread T1 (tid=28786, running) created by main thread at:
                    #0 pthread_create <null> (tsan_shared+0x00000040c794)
                    #1 _cgo_try_pthread_create <null> (libtsan_shared.so+0x00000008ad70)
                    #2 x_cgo_sys_thread_create <null> (libtsan_shared.so+0x00000008ab12)
                    #3 _rt0_amd64_lib /tmp/guix-build-go-1.10.drv-0/go/src/runtime/asm_amd64.s:56 (libtsan_shared.so+0x0000000813b6)

                SUMMARY: ThreadSanitizer: data race ??:0 __interceptor_pthread_attr_getstacksize

* gnu/packages/golang.scm (go-1.10): New variable.
(go-1.4)[native-inputs]: Use gcc:lib version 6.

gnu: Add RawTherapee.

* gnu/packages/photo.scm (rawtherapee): New variable.

gnu: Add libiptcdata.

* gnu/packages/image.scm (libiptcdata): New variable.

gnu: Add emacs-nov.

* gnu/packages/emacs.scm (emacs-nov): New variable.