jpegoptim does not compile on Solaris 9 about jpegoptim HOT 4 CLOSED

-lm is also needed for LIBS so floor can be used.

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I don't think that macro really produces same results as real round() if x < 0.
For example if x=-0.5 , round will return -1.0 but floor(0.5+(-0.5)) will return 0.0....

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I updated code [see 87640bc] to use floor() instead of round(), so now it should compile fine on old Solaris?

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Thank you! Now it compiles on Solaris 9!

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