gnu: gnome-online-accounts: Split off 'lib' output.

gnu/packages/gnome.scm (gnome-online-accounts)[outputs]: Add 'lib'.
[arguments]: Set the 'libdir' path to the 'out' output, and add a phase
to ensure that libgoa gets installed in the 'lib' output.
(evolution-data-server, gfbgraph, gnome-calendar, gnome-control-center,
gnome-todo, libgdata, libzapojit): Use the 'lib' output of
gnome-online-accounts.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

gnu/packages/gnome.scm

@@ -389,7 +389,7 @@ formats like PNG, SVG, PDF and EPS.")
        ("libsoup" ,libsoup)))
     (propagated-inputs
      `(("gcr" ,gcr)
-       ("gnome-online-accounts" ,gnome-online-accounts)
+       ("gnome-online-accounts:lib" ,gnome-online-accounts "lib")
        ("liboauth" ,liboauth)
        ("libxml2" ,libxml2)))
     (home-page "https://wiki.gnome.org/Projects/libgdata")
@@ -4941,7 +4941,23 @@ window manager.")
               (sha256
                (base32
                 "1l8p1ghknmkmjpnpl7jr53j66qbzpikickzbmrz0aczyhq6pdy29"))))
+    (outputs '("out" "lib"))
     (build-system glib-or-gtk-build-system)
+    (arguments
+     `(#:configure-flags
+       (list (string-append "--libdir=" (assoc-ref %outputs "out") "/lib"))
+       #:phases
+       (modify-phases %standard-phases
+         (add-before 'configure 'patch-libgoa-output
+           (lambda* (#:key outputs #:allow-other-keys)
+             (let ((lib (assoc-ref outputs "lib")))
+               (substitute* '("src/goa/Makefile.in" "src/goa/goa-1.0.pc.in")
+                 (("@prefix@") lib)
+                 (("@exec_prefix@") lib)
+                 (("@libdir@") (string-append lib "/lib"))
+                 (("@includedir@") (string-append lib "/include"))
+                 (("@datadir@") (string-append lib "/share")))
+               #t))))))
     (native-inputs
      `(("glib:bin" ,glib "bin") ; for glib-compile-schemas, etc.
        ("gobject-introspection" ,gobject-introspection)
@@ -5038,7 +5054,7 @@ Exchange, Last.fm, IMAP/SMTP, Jabber, SIP and Kerberos.")
     (inputs
      `(("bdb" ,bdb)
        ("gcr" ,gcr)
-       ("gnome-online-accounts" ,gnome-online-accounts)
+       ("gnome-online-accounts:lib" ,gnome-online-accounts "lib")
        ("json-glib" ,json-glib)
        ("libgweather" ,libgweather)
        ("mit-krb5" ,mit-krb5)
@@ -5631,6 +5647,7 @@ devices using the GNOME desktop.")
        ("gnome-bluetooth" ,gnome-bluetooth)
        ("gnome-desktop" ,gnome-desktop)
        ("gnome-online-accounts" ,gnome-online-accounts)
+       ("gnome-online-accounts:lib" ,gnome-online-accounts "lib")
        ("gnome-settings-daemon" ,gnome-settings-daemon)
        ("grilo" ,grilo)
        ("ibus" ,ibus)
@@ -6300,7 +6317,7 @@ library.")
        ("intltool" ,intltool)
        ("pkg-config" ,pkg-config)))
     (inputs
-     `(("gnome-online-accounts" ,gnome-online-accounts)
+     `(("gnome-online-accounts:lib" ,gnome-online-accounts "lib")
        ("json-glib" ,json-glib)
        ("rest" ,rest)))
     (home-page "https://wiki.gnome.org/Projects/Zapojit")
@@ -6373,7 +6390,7 @@ desktop.  It supports world clock, stop watch, alarms, and count down timer.")
        ("pkg-config" ,pkg-config)))
     (inputs
      `(("evolution-data-server" ,evolution-data-server)
-       ("gnome-online-accounts" ,gnome-online-accounts)
+       ("gnome-online-accounts:lib" ,gnome-online-accounts "lib")
        ("gsettings-desktop-schemas" ,gsettings-desktop-schemas)))
     (home-page "https://wiki.gnome.org/Apps/Calendar")
     (synopsis "GNOME's calendar application")
@@ -6425,7 +6442,7 @@ desktop.  It supports multiple calendars, month, week and year view.")
        ("libpeas" ,libpeas)
        ("python-pygobject" ,python-pygobject)
        ("evolution-data-server" ,evolution-data-server)
-       ("gnome-online-accounts" ,gnome-online-accounts)
+       ("gnome-online-accounts:lib" ,gnome-online-accounts "lib")
        ("gsettings-desktop-schemas" ,gsettings-desktop-schemas)))
     (home-page "https://wiki.gnome.org/Apps/Todo")
     (synopsis "GNOME's ToDo Application")
@@ -6754,7 +6771,7 @@ compiled.")
        ("gobject-introspection" ,gobject-introspection)))
     (inputs
      `(("json-glib" ,json-glib)
-       ("gnome-online-accounts" ,gnome-online-accounts)
+       ("gnome-online-accounts:lib" ,gnome-online-accounts "lib")
        ("rest" ,rest)))
     (synopsis "GLib/GObject wrapper for the Facebook API")
     (description "This library allows you to use the Facebook API from