[Bug-apl] Miscellaneous minor fixes

[Alexey Dokuchaev]

Building APL with GCC 7/8 required some minor patching: src/Error.hh,
in set_error_line_X() methods, there are calls to strncpy(3), so it
needs #include <cstring> or #include <string.h>.

Also, had to change types of total_memory from unsigned to signed,
those values are compared to values of type rlim_t which is signed.
Such comparison causes error.  Since there types are 64-bit, it does
not make sense to make them unsigned, they are huge enough to hold any
reasonable values, be it positive or negative.

On FreeBSD, I've also needed to explicitly #include <sys/socket.h>
which on GNU/Linux is included implicitly via other headers.  And two
calls to ::bind() were missing global namespace specifier which broke
the builds with compilers that default to newish C++ standards.

./danfe

misc-fixes.patch
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