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Allow make options like -j8 to be passed to the Gem compilation, which takes awfully long on a single cpu.

Make INCREMENTAL work on Windows (must be passed as make variable, as shell variable is not inherited in submakes).

for aliased zexy classes from externals/Makefile

the main loader

This reverts commit 16973649, reversing
changes made to 15094e4c.

essentially guarantees that there will be unused parameters, so these warnings
end up being noise even for external libs.

repo cleanup: remove tcl/tk build infrastructure and scripts, old patches, automated build scripts for pd-extended, old gui plugins, and unnecessary install-time dependencies

handle the discrepancy between submodule name "lyonpotpourri" and libdir name "lyon" more gracefully