use "portable" approach to forcing visible symbols in third party libs (qm-dsp, vamp-plugins, appleutility, clearlooks)

libs/appleutility/wscript

@@ -33,7 +33,7 @@ def build(bld):
     obj.source         = libappleutility_sources
     # apple did not write this library with full symbol export control
     # so we need to override any visibility default.
-    obj.cxxflags       = [ '-fvisibility=default' ]
+    autowaf.ensure_visible_symbols (obj, True)
     obj.export_includes = ['.']
     obj.includes       = ['.']
     obj.name           = 'libappleutility'

libs/clearlooks-newer/wscript

@@ -36,6 +36,7 @@ def build(bld):
     obj.uselib = 'GTK'
     obj.includes = '.'
     obj.install_path = os.path.join(bld.env['LIBDIR'], 'ardour3', 'engines')
+    autowaf.ensure_visible_symbols (obj, True)
 
     if sys.platform == 'darwin':
         # Bit of a hack: make a symlink to the .dylib that meets GTK's criteria for finding it (namely that the library must be a *.so

libs/qm-dsp/wscript

@@ -47,8 +47,7 @@ def build(bld):
             maths/MathUtilities.cpp
             base/Pitch.cpp
     '''
-    obj.cxxflags     = [ '-fvisibility=default' ]
-    obj.cflags       = [ '-fvisibility=default' ]
+    autowaf.ensure_visible_symbols (obj, True)
     obj.export_includes = ['.']
     obj.includes     = ['.']
     obj.name         = 'libqmdsp'

libs/vamp-plugins/wscript

@@ -50,8 +50,7 @@ def build(bld):
     obj.uselib       = 'FFTW3F VAMPSDK'
     obj.use          = 'libvampplugin libqmdsp'
     obj.defines      = [ 'ARDOUR_VAMP_PLUGINS_DLL_EPORTS' ]
-    obj.cxxflags     = [ '-fvisibility=default' ]
-    obj.cflags       = [ '-fvisibility=default' ]
+    autowaf.ensure_visible_symbols (obj, True)
     if bld.is_defined('HAVE_AUBIO'):
         obj.source += ' Onset.cpp '
         obj.uselib += ' AUBIO '