[RFA] Fix a parallel build error in doc

[Jie Zhang]

Hi,

I just found this when building our Blackfin port GDB with -j4 :

makeinfo --split-size=5000000  -I 
/home/jie/blackfin-sources/toolchain/trunk/binutils-2.20/gdb/doc -o 
annotate.info 
/home/jie/blackfin-sources/toolchain/trunk/binutils-2.20/gdb/doc/annotate.texinfo
echo "@set BUGURL @uref{http://www.gnu.org/software/gdb/bugs/}" >> 
./GDBvn.new
./gdb-cfg.texi:16: @include `GDBvn.texi': No such file or directory.
if [ "@uref{http://www.gnu.org/software/gdb/bugs/}" = 
"@uref{http://www.gnu.org/software/gdb/bugs/}" ]; then \
           echo "@set BUGURL_DEFAULT" >> ./GDBvn.new; \
         fi
mv GDBvn.new GDBvn.texi
makeinfo --split-size=5000000 -I 
/home/jie/blackfin-sources/toolchain/trunk/binutils-2.20/gdb/doc/../../readline/doc 
-I 
/home/jie/blackfin-sources/toolchain/trunk/binutils-2.20/gdb/doc/../mi 
-I /home/jie/blackfin-sources/toolchain/trunk/binutils-2.20/gdb/doc \
                 -o gdb.info 
/home/jie/blackfin-sources/toolchain/trunk/binutils-2.20/gdb/doc/gdb.texinfo
Making install in doc
makeinfo: Removing output file `annotate.info' due to errors; use 
--force to preserve.
make[3]: *** [annotate.info] Error 1

We should also add GDBvn.texi in ANNOTATE_DOC_BUILD_INCLUDES, shouldn't we?

Is the attached patch OK?

Thanks,
Jie
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