Modify LDFLAGS to support shared libraries for Win (#1280)

Modify LDFLAGS to support shared libraries for Win  (#1280)

* Use uintptr_t for pointer casts in Swig files

CVC4's Swig interface files were casting pointers to longs in multiple
instances. The problem with that is that on certain platforms *cough*
Windows/MinGW *cough* long is only 32-bit even when compiling a 64-bit
executable (they use the LLP64 data model). This made the compilation of
language bindings fail with MinGW. This commit changes the types to
uintptr_t defined in Swig's stdint.i.

* Modify LDFLAGS to support shared libraries for Win

This commit adds "-no-undefined" to the LDFLAGS of CVC4's library, which
is required for building DLLs (shared libraries on Windows). It also
adds "--export-all-symbols" to the linker flags of the parser to ensure
that there are no unresolved symbols when linking against it (see
comment in the Makefile.am for details).

* Fix for non-Windows builds

* add no-undefined to libcvc4compatjni