Fix compilation under Windows with GUI and LLVM enabled. * configure.ac (OCTGUI_DLL_DEFS): New substituted variabled. Define it to -DOCTGUI_DLL under MinGW and MSVC platforms. (QT_INCDIR, QT_LIBDIR): Replace backslash with forward slash characters. (OCTGUI_API): New config.h macro. * src/Makefile.am (MOC_CPPFLAGS): New variable. Define it to -DWIN32 when compiling Win32 terminal implementation. (moc-%.cc rule): Use it. (libqterminal_la_CPPFLAGS): New variable defined to -DWIN32 when compiling the win32 terminal implementation. (liboctgui_la_CPPFLAGS): Add @OCTGUI_DLL_DEFS@. * libgui/src/m-editor/file-editor-tab.cc (QApplication, QFileDialog, QTextStream): New includes. * libgui/src/m-editor/find-dialog.cc (find_dialog::search_next): Temporary fix for compilation with QScintilla < 2.6. * libgui/src/main-window.cc (QApplication, QLabel): New includes. * libgui/src/octave-gui.h (octave_start_gui): Decorate with OCTGUI_API.

syntax: regexp
# The recurrent (^|/) idiom in the regexps below should be understood
# to mean "at any directory" while the ^ idiom means "from the
# project's top-level directory".

# This one gets created by gnulib during the build, contains no Octave
# files.
^gnulib/

# These directories mostly contain cruft during build time, but they
# do contain some Octave code.
^libgnu/
^m4/

# Emacs tools create these
(^|/)TAGS$
(^|/)semantic.cache$

(/|^)Makefile\.in$
^INSTALL$

^aclocal\.m4
^build-.*($|/)
^configure$
^autom4te\.cache($|/)
^config\.h\.in$

# e.g. doc/faq/OctaveFAQ.info
#      doc/interpreter/octave.info-4
^doc/.*\.info(-\d)?$

^doc/\w*/stamp-vti$
^doc/\w*/version\.texi$
^doc/interpreter/images\.mk$

# e.g. liboctave/smx-op-inc.mk
^liboctave/[\w-]*\.mk$

^libinterp/dldfcn/module\.mk$