Remove a duplicate dependency.

spec.bib was already in $(SPEC_SRCS) and doesn't need to be
listed explicitly.

svn path=/trunk/theora/; revision=17827

doc/spec/Makefile.am

@@ -29,7 +29,7 @@ EXTRA_DIST = $(built_docs) $(SPEC_SRCS) $(FIG_SRCS) ltablex.sty
 if BUILD_SPEC
 # latex three times is the charm with references
 # long tables require the .aux file to start from scratch
-Theora.pdf : $(SPEC_SRCS) $(FIG_OBJS) vp3huff.tex spec.bib
+Theora.pdf : $(SPEC_SRCS) $(FIG_OBJS) vp3huff.tex
 	-$(RM) spec.aux
 	pdflatex -interaction nonstopmode spec.tex
 	bibtex spec.aux