[branch-2-0] fix warnings on cygwin

[Christoph Egger]

Hi!

I got some warnings when I build a program on cygwin with latest
gcc and -Wcast-qual flag:


libtool: link: creating evtimestamp.exe
./.libs/lt-evtimestamp.c: In function `main':
./.libs/lt-evtimestamp.c:95: warning: assignment discards qualifiers from
pointer target type
./.libs/lt-evtimestamp.c: In function `basename':
./.libs/lt-evtimestamp.c:148: warning: cast discards qualifiers from pointer
target type

-- 
Greetings,

Christoph

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ltmain.m4sh.diff
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