To get a clean run of check-tcg these tests are currently skipped:

  - hello-mips for mips
  - linux-test for sparc
Signed-off-by: NAlex Bennée <alex.bennee@linaro.org>
Tested-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>