install pdf and html dummy targets.

[Mike Stump]

I discovered I needed:

diff --git a/binutils/cgen/Makefile.am b/binutils/cgen/Makefile.am
index 208cd6a..8b1848b 100644
--- a/binutils/cgen/Makefile.am
+++ b/binutils/cgen/Makefile.am
@@ -29,6 +29,9 @@ srcroot = $(srcdir)/..
 
 all-local: stamp-cgen
 
+install-pdf:
+install-html:
+
 stamp-cgen: $(CGENFILES)
        rm -f stamp-cgen
        echo timestamp > stamp-cgen
diff --git a/binutils/cgen/Makefile.in b/binutils/cgen/Makefile.in
index a4080da..3e63376 100644
--- a/binutils/cgen/Makefile.in
+++ b/binutils/cgen/Makefile.in
@@ -423,6 +423,9 @@ uninstall-info: uninstall-info-recursive
 
 all-local: stamp-cgen
 
+install-pdf:
+install-html:
+
 stamp-cgen: $(CGENFILES)
        rm -f stamp-cgen
        echo timestamp > stamp-cgen

to allow doc building without error in a combined tree.  Not sure this has been fixed since last time I did an import, probably not.

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