[Ecls-list] Adding long long support to FFI.

[Greg Pfeil]

Here is (probably hackish) support for long long ints in ECL's FFI. It 
checks for the HAVE_LONG_LONG symbol defined by AC_C_LONG_LONG. Also, 
-std=gnu99 is added to the gcc CFLAGS so that the (U)LLONG_(MIN|MAX) 
are properly defined.

If this is accepted, it makes a slightly weird situation for CFFI, 
deciding whether or not to add CFFI-FEATURES:NO-LONG-LONG to 
*FEATURES*. Should ECL maybe add a :LONG-LONG-SUPPORT symbol to 
features if it supports them?
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