ldexp* tests: More tests. * tests/test-ldexp.h (test_function): Add some pseudo-randomized tests. * tests/test-ldexp.c (RANDOM): New macro. * tests/test-ldexpf.c (RANDOM): New macro. * tests/test-ldexpl.c (RANDOM): New macro. * modules/ldexp-tests (Files): Add tests/randomd.c. (Makefile.am): Add randomd.c to test_ldexp_SOURCES. * modules/ldexpf-tests (Files): Add tests/randomf.c. (Makefile.am): Add randomf.c to test_ldexpf_SOURCES. * modules/ldexpl-tests (Files): Add tests/randoml.c. (Makefile.am): Add randoml.c to test_ldexpl_SOURCES.