deleted unnecessary makefile

[[Imported from SVN: r590]]

doc/istl/Makefile.am

-# $id: $
-
-SUBDIRS = comm
-
-if BUILD_DOCS
-  DOCS = istl.pdf istl.ps
-endif
-
-dist_pkgdata_DATA = $(DOCS)
-
-CLEANFILES = *.aux *.bbl *.blg *.log *.out *.toc *.dvi *.pdf *.ps
-
-# setting like in dune-web
-CURDIR=doc/istl
-
-include $(top_srcdir)/am/latex
-include $(top_srcdir)/am/webstuff
-include $(top_srcdir)/am/global-rules