Fix #3225: Check for old Rust libraries when building and installing.
When building Rust libraries (e.g. librustc, libstd, etc), checks for and verbosely removes previous build products before invoking rustc. (Also, when Make variable VERBOSE is defined, it will list all of the libraries matching the object library's glob after the rustc invocation has completed.) When installing Rust libraries, checks for previous libraries in target install directory, but does not remove them. The thinking behind these two different modes of operation is that the installation target, unlike the build tree, is not under the control of this infrastructure and it is not up to this Makefile to decide if the previous libraries should be removed.
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