Wrong types on GetClassName functions' parameters.

[CentricStorm]

The GetClassNameA and GetClassNameW functions' lpClassName parameters should be pointers to mutable strings (LPSTR and LPWSTR, respectively):

winapi-rs/src/um/winuser.rs

Lines 5150 to 5159 in 7abd241

	pub fn GetClassNameA(
	hWnd: HWND,
	lpClassName: LPCSTR,
	nMaxCount: c_int,
	) -> c_int;
	pub fn GetClassNameW(
	hWnd: HWND,
	lpClassName: LPCWSTR,
	nMaxCount: c_int,
	) -> c_int;