[libxslt] Fix deprecated Travis compiler flag

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 5f24cd213ea7a666a560c9cd4f4144ee3e975d42
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Wed Oct 25 18:43:54 2017 +0200

    Fix deprecated Travis compiler flag

 .travis.yml |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/.travis.yml b/.travis.yml
index a6d110b..8994be0 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,7 +12,7 @@ matrix:
     - compiler: clang
       dist: trusty
       env: CONFIG="--without-python"
-           CFLAGS="-O2 -g -fno-omit-frame-pointer -fsanitize=address,undefined -fno-sanitize-recover"
+           CFLAGS="-O2 -g -fno-omit-frame-pointer -fsanitize=address,undefined -fno-sanitize-recover=all"
            UBSAN_OPTIONS=print_stacktrace=1
 script:
 - |