make clean cleans too much in doc and removes all *.gp and *.png files

[J G Miller]

For source code enblend-enfuse, doing a make clean from the top level directory (and also from the doc directory its-self) causes the deletion of all *.gp files

rm -f *.eps *.png *.pstex *.gp

However these .gp files are not dynamically created and their presence (coming from the source archive) is needed to build the documentation.

./docstrings key-value \
            UPDATED '2016-03-29\datebyfs' \
            VERSION '4.2' \
            DOCDIR '/usr/local/share/doc/enblend-enfuse' > enblend-version.tex
make[3]: *** No rule to make target 'colors.gp', needed by 'log-transform.gp'. Stop.
make[3]: Leaving directory '/usr/src/build/enblend-enfuse-4.2/doc'
Makefile:580: recipe for target 'all-recursive' failed

Not tested, but I suspect that the *.png should not be deleted either, since these are also only supplied from the unpacked source archive.

--- Makefile.am.ORIG 2017-03-11 21:38:33.947959712 +0100
+++ Makefile.am 2017-03-11 21:38:33.947959712 +0100
@@ -111,7 +111,7 @@

 .PHONY: clean-local
 clean-local:
- - rm -f *.eps *.png *.pstex
+ - rm -f *.eps *.pstex
        - rm -f *.{g,o,p,a}nd *.{g,o,p,a}dx
        - rm -f *.idx *.ilg *.ind *.lo{a,f,t,x} *.toc
        - rm -f *.aux *.log *.dvi *.ps *.pdf

[Christoph Spiel (cspiel)]

Please check out revision ba3e20d0947b:
    http://hg.code.sf.net/p/enblend/code/rev/ba3e20d0947b
whether it solves the problem and the bug
description is accurate enough.

THX for supplying a patch!

/cls