Proposed changes for Borland (fix build errors, purify projects, fix memory leaks)

Summary of changes:
1) Fix the ambiguity of DOMDocument in some samples/tests (WIN32_LEAN_AND_MEAN define was added to some mak-files)
2) DeprecatedDOMTest will use the dummy 'main' when xercesc dll has no deprecated DOM
3) cpp-files with comments "Dummy entry point to satisfy the BCB IDE" unnecessary because of absence of projects for the IDE in BCC.551 directory
4) Bug in the Borland compiler (BCC32 5.5.1, BCB5, BCB6) lead to leakage of memory allocated for runtime exception information when 'break'/'continue' used for leave the 'catch' block. Workaround is using boolean variable that controls of 'break'/'continue' execution out of the 'catch' block.