Tests: Improve RunCMake.ExternalProject rebuild case robustness

The `CONFIGURE_HANDLED_BY_BUILD` case occasionally fails on builds with
the `Borland Makefiles` generator due to the `make` tool's 1s file
timestamp resolution.  Somehow the 1.125s delay is not enough.  Several
other tests use a 3s delay for Borland tools for the same reason.
1 file changed