Avoid useless recursion into GUI directories

modules/gui/Modules.am

-SUBDIRS = beos pda macosx minimal_macosx qnx qt4 skins2 wxwidgets wince
+DIST_SUBDIRS = beos macosx minimal_macosx pda qnx qt4 skins2 wxwidgets wince
+SUBDIRS =
+
+if HAVE_BEOS
+SUBDIRS += beos
+endif
+if HAVE_DARWIN
+SUBDIRS += macosx minimal_macosx
+endif
+if BUILD_PDA
+SUBDIRS += pda
+endif
+SUBDIRS += qnx
+if ENABLE_QT4
+SUBDIRS += qt4
+endif
+if BUILD_SKINS
+SUBDIRS += skins2
+endif
+SUBDIRS += wxwidgets
+if HAVE_WINCE
+SUBDIRS += wince
+endif
+
 SOURCES_ncurses = ncurses.c
 SOURCES_fbosd = fbosd.c

modules/gui/qt4/Modules.am

@@ -64,9 +64,7 @@ nodist_SOURCES_qt4 = \
 		ui/streampanel.h \
 		ui/sout.h
 
-if ENABLE_QT4
 BUILT_SOURCES += $(nodist_SOURCES_qt4)
-endif
 
 resources.cpp: vlc.qrc
 	$(RCC) -name vlc -o $@ $<