test: fixing variable names for test suite inside configure.ac.
    
    Both variables for gcov and oom have wrong names inside configure.ac.
    For this reason, the Test Suite configuration is not showing the current
    configuration.
    
    Before patching:
    configure:    windres: no
    configure:
    configure: Test suite
    configure:
    configure:          Coverage:
    configure:         Alloc OOM:
    configure:
    configure: Miscellaneous
    
    After patching (using --enable-test-coverage and --enable-test-oom):
    configure:    windres: no
    configure:
    configure: Test suite
    configure:
    configure:          Coverage: yes
    configure:         Alloc OOM: yes
    configure:
    configure: Miscellaneous
    
    Signed-off-by: Julio Faracco <jcfaracco@gmail.com>