Pavel Roskin 00e70a5c54 Use standard autotools means to detect X11
Use AC_PATH_XTRA to search for X11 in configure.ac. In Makefiles, add
X_CFLAGS to AM_CFLAGS for the source compilation. Add X_LIBS to LDFLAGS.
Add X_PRE_LIBS and X_EXTRA_LIBS to LDADD.

With this patch, X Windows system is correctly detected on Mac OS X.
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