gnu: libstdc++: Support cross-compilation to powerpc64le-linux-gnu.

Previously the phase would fail when cross-compiling because the patch
could not be found in ‘inputs’.

* gnu/packages/gcc.scm (make-libstdc++): Add alternative ‘patch-powerpc’
phase for when (%current-target-system) is true.

Change-Id: Ia503d761d34596d95cc9d33edd911cebcc2e0d9e

gnu: hwloc: Remove dependency on graphics libraries when cross-compiling.

* gnu/packages/mpi.scm (hwloc-1)[inputs]: Remove dependency on graphics
libraries when cross-compiling.

Change-Id: I698ac3f8aadda634f6753bdeba0f5fbd77e608df

gnu: clyrics: Update to 0.16.

* gnu/packages/music.scm (clyrics): Update to 0.16.

Change-Id: Ie60ab9136accbb029e3072ed60aaa0f8341d3178

ssh: ‘open-ssh-session’ displays the port number upon error.

* guix/ssh.scm (open-ssh-session): Show the port number in error message.

Change-Id: I18a3dc54223bb29782dcdd43d3252c720525c31d

gnu: Add guile-gsl.

* gnu/packages/guile-xyz.scm (guile-gsl): New variable.

Co-autherd-by: Artyom V. Poptsov <poptsov.artyom@gmail.com>
Signed-off-by: Sharlatan Hellseher <sharlatanus@gmail.com>

Change-Id: Iaa152d3ab2088425519c13bafe2cbbc9098c1afa

gnu: guile-png: Update to 0.7.3.

* gnu/packages/guile-xyz.scm (guile-png): Update to 0.7.3.

Reviewed-by: Munyoki Kilyungi <me@bonfacemunyoki.com>
Signed-off-by: Sharlatan Hellseher <sharlatanus@gmail.com>

Change-Id: I3e88a5d19f7f07b4daeac7b3a06fc2099cd35c44

gnu: guile-lmdb: Update to 0.0.1-1.ea9aa1d.

* gnu/packages/guile-xyz.scm (guile-lmdb): Update to 0.0.1-1.ea9aa1d.
[description]: Extend it.

Signed-off-by: Sharlatan Hellseher <sharlatanus@gmail.com>
Change-Id: I136f8feb91540a5a1564f9f693446dc65ec57f2e

gnu: qthttpserver: Update to 6.6.3.

* gnu/packages/qt.scm (qthttpserver): Update to 6.6.3.

Change-Id: I853774a8a92c25dd9d1d34726228b6c8a4acd681

gnu: qtwebengine: Update to 6.6.3.

* gnu/packages/qt.scm (qtwebengine): Update to 6.6.3.

Change-Id: I9f2c9567afa626bb1f40c1d27280a45c6c73fd9c

gnu: qtspeech: Update to 6.6.3.

* gnu/packages/qt.scm (qtspeech): Update to 6.6.3.

Change-Id: I48fcd8cc331d5e3a4997e774b2dacd58abd07f27

gnu: qtremoteobjects: Update to 6.6.3.

* gnu/packages/qt.scm (qtremoteobjects): Update to 6.6.3.

Change-Id: I258d01be5e9faedb0ba7b31e80b3b8eae28525de

gnu: qtnetworkauth: Update to 6.6.3.

* gnu/packages/qt.scm (qtnetworkauth): Update to 6.6.3.

Change-Id: Id42e03158620c504bbedbb6f658e685deeb9491a

gnu: qtpositioning: Update to 6.6.3.

* gnu/packages/qt.scm (qtpositioning): Update to 6.6.3.

Change-Id: I9e585c0a114e91d11ffe34255ba3e334bead9591

gnu: qtscxml: Update to 6.6.3.

* gnu/packages/qt.scm (qtscxml): Update to 6.6.3.

Change-Id: Icf3a4450642a28cedcaa3d47f13682c51c89d72f

gnu: qttranslations: Update to 6.6.3.

* gnu/packages/qt.scm (qttranslations): Update to 6.6.3.

Change-Id: I4f4ef3fbe86d541c3391737a08ea25b70678e6d4

gnu: qttools: Update to 6.6.3.

* gnu/packages/qt.scm (qttools): Update to 6.6.3.

Change-Id: I4af3ac08a0ca7a0894a88a1bfbc9bc23b49c9d69

gnu: qtlottie: Update to 6.6.3.

* gnu/packages/qt.scm (qtlottie): Update to 6.6.3.

Change-Id: I360f07727ebee027003e7e2f60394b1f2dfb1b65

gnu: qtlanguageserver: Update to 6.6.3.

* gnu/packages/qt.scm (qtlanguageserver): Update to 6.6.3.

Change-Id: I32de0ade2aa4c2216df43782a30c0494db1c331b

gnu: qtwebchannel: Update to 6.6.3.

* gnu/packages/qt.scm (qtwebchannel): Update to 6.6.3.

Change-Id: I2eb1f199743ecde5921eacf978127b5e2e33799f

gnu: qtwayland: Update to 6.6.3.

* gnu/packages/qt.scm (qtwayland): Update to 6.6.3.

Change-Id: I6edcdcc87ed9b920700dd834475cb9eb58332948