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Edwin Török
2f2b76d47c
Trying to include .ocamldep.make will cause it to be generated if it
doesn't exist.
We do not want this during make clean: we would remove it anyway.
Speeds up make clean.
Before (measured on f732240fd3, July 2022):
```
Parsing /home/edwin/xen2/tools/ocaml/libs/xl/../../../../tools/libs/light/libxl_types.idl
Parsing /home/edwin/xen2/tools/ocaml/libs/xl/../../../../tools/libs/light/libxl_types.idl
Parsing /home/edwin/xen2/tools/ocaml/libs/xl/../../../../tools/libs/light/libxl_types.idl
Parsing /home/edwin/xen2/tools/ocaml/libs/xl/../../../../tools/libs/light/libxl_types.idl
Parsing /home/edwin/xen2/tools/ocaml/libs/xl/../../../../tools/libs/light/libxl_types.idl
Performance counter stats for 'make clean -j8 -s' (5 runs):
4.2233 +- 0.0208 seconds time elapsed ( +- 0.49% )
```
After:
```
perf stat -r 5 --null make clean -j8 -s
Performance counter stats for 'make clean -j8 -s' (5 runs):
2.7325 +- 0.0138 seconds time elapsed ( +- 0.51% )
```
No functional change.
Signed-off-by: Edwin Török <edvin.torok@citrix.com>
Acked-by: Christian Lindig <christian.lindig@citrix.com>