Masks for XParseGeometry result missing

[Ryan1729]

I'm porting some C code to Rust and I just had to dig these values out of X11/Xutil.h in order to move the part that interpreted the result of XParseGeometry into Rust.

/*
 * Bitmask returned by XParseGeometry().  Each bit tells if the corresponding
 * value (x, y, width, height) was found in the parsed string.
 */
#define NoValue		0x0000
#define XValue  	0x0001
#define YValue		0x0002
#define WidthValue  	0x0004
#define HeightValue  	0x0008
#define AllValues 	0x000F
#define XNegative 	0x0010
#define YNegative 	0x0020 

It would be nice if these values were available through this crate.

[ghost]

a0e55af