minor issues when building ncurses-5.6 with libtool

[Michael Haubenwallner]

Hi,

there are two minor issues (depending on libtool and compiler used).
1) The libtool object files are still called '.o' (should be '.lo').
2) libtool might not detect that it should use tag 'CC'.

Can't remember the actual error messages, but those two have shown up on
aix when using CC=powerpc-ibm-aix5.3.0.0-gcc.

Attached patch fixes them.

Thanks!

/haubi/

ncurses-5.6-libtool.patch
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