Small fixes for STLPort compliance

Small fixes for STLPort compliance

	* src/cursor.C: add using std::for_each;

	* src/graphics/GraphicsTypes.h: add #include <string>

	* src/graph.C: add using std::fill;

	* src/frontends/controllers/helper_funcs.h: add #include <algorithm>

	* src/bufferview_funcs.C: add using std::find;

	* src/lyx_main.C: add using std::for_each;

	* configure.ac: don't use boost format on cygwin

git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@15176 a592a061-630c-0410-9148-cb99ea01b6c8