`make clean` does not remove all build files (msgidx.inc, msgtxt.inc)

If you run the commands:

git clone https://gitlab.com/freepascal.org/fpc/source.git fpcsrc
cd fpcsrc
make all install "INSTALL_PREFIX=<some-path>"
make clean

then after make clean the repository will return to the same state as after git clone, except for two files that will remain:

compiler\msgidx.inc
compiler\msgtxt.inc

This is a minor issue, but all build files are expected to be removed by make clean.

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