makekeys: update to match the rest of libX11 makekeys

makekeys: update to match the rest of libX11 makekeys

This integrates two commits from libX11:

ebd6ef0a4db0ddef0ae17ad14571518ccdeea5ba
   XStringToKeysym: Special case for XF86 keysyms

    Some XFree86 keysyms were in XKeysymDB as XF86_foo, despite really being
    XF86foo.  So, if we get to the bottom of XStringToKeysym and haven't
    found our XF86_foo, try it again as XF86foo.

    Signed-off-by: Daniel Stone <daniel@fooishbar.org>
    Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com>
00175397480b76d32bf82b0c7c94c91a2a95954e
    makekeys: Scan vendor keysyms as well as core

    Since we can't really live without vendor keysyms, scan them all in to
    generate ks_tables.h, rather than only doing the core ones, and leaving
    the vendor syms to be manually synchronised with XKeysymDB.

    Signed-off-by: Daniel Stone <daniel@fooishbar.org>
    Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Notice that the xkey.sh test is changed to match libX11 behavior, i.e.
XKeysymToString(0x1008FE20) -> "XF86Ungrab" as opposed to "XF86_Ungrab".

Signed-off-by: Ran Benita <ran234@gmail.com>