fix doc/build_draft.sh run error

Add newer source directories to the destdir file tree so we
can include all sources referenced from opus_sources.mk.

Signed-off-by: Ralph Giles <giles@thaumas.net>

doc/build_draft.sh

@@ -48,7 +48,16 @@ mkdir "${destdir}/src"
 mkdir "${destdir}/silk"
 mkdir "${destdir}/silk/float"
 mkdir "${destdir}/silk/fixed"
+mkdir "${destdir}/silk/fixed/x86"
+mkdir "${destdir}/silk/fixed/arm"
+mkdir "${destdir}/silk/fixed/mips"
+mkdir "${destdir}/silk/x86"
+mkdir "${destdir}/silk/arm"
+mkdir "${destdir}/silk/mips"
 mkdir "${destdir}/celt"
+mkdir "${destdir}/celt/x86"
+mkdir "${destdir}/celt/arm"
+mkdir "${destdir}/celt/mips"
 mkdir "${destdir}/include"
 for f in `cat "${toplevel}"/opus_sources.mk "${toplevel}"/celt_sources.mk \
  "${toplevel}"/silk_sources.mk "${toplevel}"/opus_headers.mk \