libidn fails when builddir!=srcdir and wchar.h is unavailable

[Mike Frysinger]

the examples/, src/, and test/ subdirs explicitly include wchar.h.  they also 
set up their CPPFLAGS to point to the gl/ and lib/ subdirs.  however, the 
wchar.h replacement is generated in lib/gl/, not gl/ and not lib/.  so the 
directories in question need this added to their AM_CPPFLAGS:
-I$(top_builddir)/lib/gl
-mike

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