[tlbuild] proposed change to xdvi.c

[Nelson H. F. Beebe]

>> good catch, applied as r26011 (however, with long instead of double).

That works for IA-64, where we have (from my features-1.2.1 tests)

	sizeof(char)                 	=    1
	sizeof(short)                	=    2
	sizeof(int)                  	=    4
	sizeof(long)                 	=    8
	sizeof(long long)            	=    8

However, there may be other platforms where the alignment of 8-byte
boundary is needed by the X11 library, but sizeof(long) == 4.  That is
why I intentionally used "double", which is guaranteed to be 8-byte
aligned on all byte-addressed systems.  

No arithmetic is required, just addressing, so I think the type really
should be "double", not the system- and compiler-dependent "long".


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