[Libevent-users] test/*.c files use installed header files not the ones from the package

[Marc Lehmann]

during integration of libev into libevent, I found that the test/* files
include the *installed* header files instead of the ones from the package.

this doesn't work if there are any structure changes (obviously the structure
change in this case was going to libev).

fixing the #include <event.h> statements to use "" fixed this.

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