Remove xf86Version.h and related API.

We haven't meaningfully been API-compatible with xf86 modules in ages,
let's stop pretending.

hw/xfree86/common/Makefile.am

@@ -47,7 +47,7 @@ INCLUDES = $(XORG_INCS) -I$(srcdir)/../ddc -I$(srcdir)/../i2c \
 sdk_HEADERS = compiler.h fourcc.h xf86.h xf86Module.h xf86Opt.h \
               xf86PciInfo.h xf86Priv.h xf86Privstr.h xf86Resources.h \
               xf86cmap.h xf86fbman.h xf86str.h xf86RAC.h xf86Xinput.h xisb.h \
-              $(XVSDKINCS) xf86Version.h xorgVersion.h \
+              $(XVSDKINCS) xorgVersion.h \
               xf86sbusBus.h xf86xv.h xf86xvmc.h xf86xvpriv.h
 
 DISTCLEANFILES = xf86Build.h