gdb/testsuite/

gdb/testsuite/
	* gdb.base/break-interp.exp: Use ldlags for linking flags.
	* gdb.base/prelink.exp: Likewise.
	* gdb.base/solib-nodir.exp: Likewise.
	* lib/gdb.exp (gdb_compile) <*-*-openbsd*>
	(gdb_compile) <shlib_load>: Use ldlags for linking flags.
	* lib/prelink-support.exp (build_executable_own_libs): Likewise.