ports/177913: graphics/shotwell: Fix build

[David Thiel]

This doesn't work for me on 9.1:

/usr/ports/graphics/shotwell/work/shotwell-0.11.6/thumbnailer/shotwell-video-thumbnailer.vala:22:
warning: 'g_thread_init' is deprecated (declared at
/usr/local/include/glib-2.0/glib/deprecated/gthread.h:260)
Compilation succeeded - 3 warning(s)
cc src/unit/Unit.o src/util/Util.o src/util/file.o src/util/image.o
src/util/misc.o src/util/string.o src/util/system.o

(snip)

src/.unitize/_LibraryInternals.o src/.unitize/_DirectInternals.o
src/.unitize/_CoreInternals.o src/.unitize/_SidebarInternals.o
src/.unitize/_EventsInternals.o src/.unitize/_TagsInternals.o
src/.unitize/_FacesInternals.o src/.unitize/_CameraInternals.o
src/.unitize/_SearchesInternals.o src/.unitize/_ConfigInternals.o
src/.unitize/_Library_unitize_entry.o
src/.unitize/_Direct_unitize_entry.o -O2 -pipe -fno-strict-aliasing
-fPIC -DG_UDEV_API_IS_SUBJECT_TO_CHANGE   `pkg-config --libs atk gdk-2.0
gdk-x11-2.0 gee-1.0 gexiv2 gio-unix-2.0 glib-2.0 gmodule-2.0
gstreamer-0.10 gstreamer-base-0.10 gstreamer-pbutils-0.10 gtk+-2.0
libexif libgphoto2 libsoup-2.4 libxml-2.0 sqlite3 unique-1.0 webkit-1.0
gconf-2.0  gthread-2.0` `pkg-config --libs libraw` -export-dynamic -o
shotwell
/usr/local/lib/libraw.so: undefined reference to
`std::ctype<char>::_M_widen_init( const at GLIBCXX_3.4.11'
gmake: *** [shotwell] Error 1
*** [do-build] Error code 1

Stop in /usr/ports/graphics/shotwell.