[Xcb] another "no rule to make target `xproto.c'"

[Vincent Torri]

> So, I was missing the xproto.c file from the beginning. Not any more.
> lixcb-0.9 compiled just fine, although I did have to replace
> "#include <stdint.h>" by "#include <inttypes.h>" in src/xcb.h file
> to make it work in my solaris-2.7.

iirc, with autoconf, we can check if stdint.h exists and a varaible
(__HAVE_SDTINT_H__) is defined. Then we can use it so that we include
stdint or inttypes, no ?

Vincent