Skip some tests when running under QEMU user-mode.

* tests/qemu.h: New file.
* tests/test-get-rusage-as.c: Include qemu.h.
(main): Skip the test when running under QEMU.
* tests/test-get-rusage-data.c: Include qemu.h.
(main): Skip the test when running under QEMU.
* tests/test-printf-posix2.c: Include qemu.h.
(main): Return with code 77 when running under QEMU.
* tests/test-fprintf-posix2.c: Include qemu.h.
(main): Return with code 77 when running under QEMU.
* tests/test-fprintf-posix3.c: Include qemu.h.
(main): Return with code 79 when running under QEMU.
* tests/test-fprintf-posix3.sh: Skip the test when the return code was
79.
* tests/test-dprintf-posix2.c: Include qemu.h.
(main): Return with code 79 when running under QEMU. Use return code 80
instead of 78.
* tests/test-dprintf-posix2.sh: Skip the test when the return code was
79. Update for changed return code.
* modules/get-rusage-as-tests (Files): Add qemu.h.
(Depends-on): Add stdbool.
* modules/get-rusage-data-tests (Files): Add qemu.h.
(Depends-on): Add stdbool.
* modules/fprintf-posix-tests (Files): Add qemu.h.
(Depends-on): Add stdbool.
* modules/dprintf-posix-tests (Files): Add qemu.h.
(Depends-on): Add stdbool.

modules/fprintf-posix-tests

@@ -8,10 +8,12 @@ tests/test-fprintf-posix2.c
 tests/test-fprintf-posix3.sh
 tests/test-fprintf-posix3.c
 tests/infinity.h
+tests/qemu.h
 tests/signature.h
 tests/macros.h
 
 Depends-on:
+stdbool
 stdint
 get-rusage-as