[Test] contrib/test_installed modified to set specific gcov

[Anna Tikhonova]

Hi,

while running check for Android NDK compiler (I've used
contrib/test_installed for it) I've noticed that gcov name is
hardcoded in g++.dg/gcov/gcov.exp.
All NDK x86 tools have prefix like i686-linux-android-, so testing
will fail to spawn gcov.

The patch attached introduces --with-gcov flag of
contrib/test_installed so one could set specific gcov for testing.
As workaround we could create a wrapper script named 'gcov' pointing
to specific gcov in directory where GCC_UNDER_TEST resides.

What do you think of this patch? Do you find it usefull? Thanks in advance.

Anna
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