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PDF from https://bugs.freedesktop.org/show_bug.cgi?id=11849
shows a high rate of creation/destruction of SplashPath
objects. At the same time, only a few exists at the same
time. This patch implements a small cache to recycle
SplashPath objects. In my test rendering time for the above
PDF dropped ~4%, mostly thanks to decent reduction in
malloc/free calls.

Revert "replace extremely confusing 'a*(int)sizeof(foo)/sizeof(foo) != a' which, due to type promotions, if a is int, is equivalent to a < 0; fix problems revealed by the change"

This reverts commit 08bf7c11.

Also enable this code for Windows, since CDECL was what
was throwing msvc off.

replace extremely confusing 'a*(int)sizeof(foo)/sizeof(foo) != a' which, due to type promotions, if a is int, is equivalent to a < 0; fix problems revealed by the change