sqrt* tests: More tests.

sqrt* tests: More tests.

* tests/test-sqrt.h: New file.
* tests/test-sqrt.c: Include <float.h> and test-sqrt.h.
(main): Invoke test_function.
* tests/test-sqrtf.c: Include <float.h> and test-sqrt.h.
(main): Invoke test_function.
* tests/test-sqrtl.c: Include <float.h> and test-sqrt.h.
(main): Invoke test_function.
* modules/sqrt-tests (Files): Add tests/test-sqrt.h, tests/randomd.c.
(Makefile.am): Add randomd.c to test_sqrt_SOURCES.
* modules/sqrtf-tests (Files): Add tests/test-sqrt.h, tests/randomf.c.
(Makefile.am): Add randomf.c to test_sqrtf_SOURCES.
* modules/sqrtl-tests (Files): Add tests/test-sqrt.h, tests/randoml.c.
(Depends-on): Add 'float'.
(Makefile.am): Add randoml.c to test_sqrtl_SOURCES.