put MAC_PACKAGE_DIR/include on header search path for all plugins

Author: beOn

Builds/MacOSX/Plugins/Config/Plugin.xcconfig

@@ -46,7 +46,7 @@ GCC_WARN_UNDECLARED_SELECTOR = YES
 GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE
 GCC_WARN_UNUSED_FUNCTION = YES
 GCC_WARN_UNUSED_VARIABLE = YES
-HEADER_SEARCH_PATHS = ../../../../JuceLibraryCode ../../../../JuceLibraryCode/modules ../../../../Source/Plugins/Headers $(inherited)
+HEADER_SEARCH_PATHS = ../../../../JuceLibraryCode ../../../../JuceLibraryCode/modules ../../../../Source/Plugins/Headers $(MAC_PACKAGE_DIR)/include $(inherited)
 INSTALL_PATH = $(HOME)/Applications/open-ephys.app/Contents/PlugIns
 MACOSX_DEPLOYMENT_TARGET = 10.9
 OTHER_LDFLAGS = $(inherited) -undefined dynamic_lookup