Changes required to get the revector functions called.

o	Remove centralized LDFLAGS and apply them per library and per executable
o	Create macros for creating dependency lists and C flags for shared
	objects.
o	Allow the output file to be set for error and logging messages.
o	Add open64 and brk system calls.
o	Modify conns_first() to return NULL if the list is empty.
o	Add simple, temporary system call revector functions to use during
	startup.