Inline clipboard functions

No need to keep a function that only calls another function in the same
file.

Signed-off-by: Devin J. Pohly <djpohly@gmail.com>

win.h

@@ -10,11 +10,9 @@ void drawregion(int, int, int, int);
 
 void xbell(void);
 void xclipcopy(void);
-void xclippaste(void);
 void xhints(void);
 void xloadcols(void);
 int xsetcolorname(int, const char *);
 void xsettitle(char *);
 void xsetpointermotion(int);
-void xselpaste(void);
 void xsetsel(char *, Time);