Fix build errors in Ubuntu focal

- Ubuntu focal uses glib 2.64.6 which does not include errno.h
  so config.h includes errno.h as the workaround.
- make autogen.sh not to delete dist files in Travis
- Call $(PYTHON) for gensimple.py for Ubuntu python3
- Add a code review in src/ibuscomposetable.c

BUG=https://github.com/ibus/ibus/pull/2348

1 files changed, 1 insertions, 1 deletions

diff --git a/autogen.sh b/autogen.sh
index 693a2740..ea633e06 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -53,4 +53,4 @@ ACLOCAL_FLAGS="$ACLOCAL_FLAGS -I m4" REQUIRED_AUTOMAKE_VERSION=1.11 CFLAGS="$CFL
         echo "rm $f"
         rm $f
     done
-}
+} || :