Test alignment of constructor / destructor calls as well as the stack
of new threads. Currently implement for i386 and AMD64.

Simplify.

TESTSBASE is provided by bsd.own.mk now.

Replace csu test case with a C++ based version. This makes the various
assembler routines obsolete. Be more exhaustive by testing dynamically
linked, statically linked and dynamically loaded.

XXX cu

Replace csu test case with a C++ based version. This makes the various
assembler routines obsolete. Be more exhaustive by testing dynamically
linked, statically linked and dynamically loaded.

XXX currently hard-codes /usr/tests due to limitations of bsd.test.mk

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