jigdo: use of undelared identifier 'setenv' in compat.hh

[whcordis@…]

Got the below error when attempting to compile the current version of jigdo on OS 10.9 with Xcode 5.0.1

:info:build /usr/bin/clang++ $cxx -c mktemplate.cc -o mktemplate.o
:info:build In file included from compat.cc:16:
:info:build In file included from cachefile.cc:17:
:info:build ./compat.hh:47:25: warning: implicit conversion changes signedness: 'uint64' (aka 'unsigned long') to 'off_t' (aka 'long long') [-Wsign-conversion]
:info:build ./compat.hh:47:25: warning: implicit conversion changes signedness: 'uint64' (aka 'unsigned long') to 'off_t' (aka 'long long') [-Wsign-conversion]
:info:build   return truncate(path, length);
:info:build          ~~~~~~~~       ^~~~~~
:info:build   return truncate(path, length);
:info:build          ~~~~~~~~       ^~~~~~
:info:build ./compat.hh:84:11: ./compat.hh:84:11: error: use of undeclared identifier 'setenv'
:info:build   return (setenv(name, value, 1) == 0) ? SUCCESS : FAILURE;
:info:build           ^
:info:build error: use of undeclared identifier 'setenv'
:info:build   return (setenv(name, value, 1) == 0) ? SUCCESS : FAILURE;
:info:build           ^
:info:build 1 warning and 1 error generated.
:info:build make[1]: *** [cachefile.o] Error 1
:info:build make[1]: *** Waiting for unfinished jobs....
:info:build 1 warning and 1 error generated.
:info:build make[1]: *** [compat.o] Error 1

[whcordis@…]

Full Log for compile failure

[ryandesign (Ryan Carsten Schmidt)]

r113020