Remove extra single-quotes copied from Unix build. Win32 doesn't strip

single quotes...

src/tools/msvc/builddoc.bat

@@ -29,7 +29,7 @@ perl mk_feature_tables.pl NO ..\..\..\src\backend\catalog\sql_feature_packages.t
 echo Running first build...
 %DOCROOT%\%OPENJADE%\bin\openjade -V draft-mode -wall -wno-unused-param -wno-empty -D . -c %DOCROOT%\%DSSSL%\catalog -d stylesheet.dsl -i output-html -t sgml postgres.sgml 2>&1 | findstr /V "DTDDECL catalog entries are not supported"
 echo Running collateindex...
-perl %DOCROOT%\%DSSSL%\bin\collateindex.pl -f -g -i 'bookindex' -o bookindex.sgml HTML.index
+perl %DOCROOT%\%DSSSL%\bin\collateindex.pl -f -g -i bookindex -o bookindex.sgml HTML.index
 echo Running second build...
 %DOCROOT%\%OPENJADE%\bin\openjade -V draft-mode -wall -wno-unused-param -wno-empty -D . -c %DOCROOT%\%DSSSL%\catalog -d stylesheet.dsl -i output-html -t sgml postgres.sgml 2>&1 | findstr /V "DTDDECL catalog entries are not supported"