start to use const specifier for strings to reduce number of warnings

start to use const specifier for strings to reduce number of warnings

2006-10-25  Jürg Billeter  <j@bitron.ch>

	* vala/valacodegenerator.vala, vala/valaarray.vala,
	  vala/valacallback.vala, vala/valaclass.vala, vala/valadatatype.vala,
	  vala/valaenum.vala, vala/valaflags.vala, vala/valainterface.vala,
	  vala/valastruct.vala, vala/valatypereference.vala, vapi/glib-2.0.vala:
	  start to use const specifier for strings to reduce number of warnings
	  during C compilation

svn path=/trunk/; revision=151