Ignore Assembly language integration test on Windows

- This test requires 32 & 64 bit sources for each test platform
- For GCC the 32-bit sources will assemble with 64-bit options (but won’t execute)
- For Windows, the sources won’t even assemble, making this test fail
Use 32-bit binaries when testing CUnit

- This is a fix for the build: we should test that we can build both
  32 & 64 bit variants against CUnit on platforms that support this.