Fix warning about %lu being used with an int in 32 bit wxOSX build.

NSUInteger is unsigned long in 64 bit builds, but unsigned int in 32 bits, so
case it to long explicitly to avoid warnings about using it with %lu format
specifier.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76284 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
Don't use %i format specifier for size_t values.

In 64 bit build, size_t can be 64 bits while %i expects a 32 bit value.
Fix this by just avoiding the unnecessary use of size_t, the number of entries
in the index is not going to be greater than 2^32.

Closes #16163.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@76285 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775