BUILD: CI: temporarily disable ASAN

it turned out that ASAN breaks things. until this is resolved,
let us disable ASAN
diff --git a/.travis.yml b/.travis.yml
index a656624..8fb9064 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -82,7 +82,6 @@
   - scripts/build-ssl.sh > build-ssl.log 2>&1 || (cat build-ssl.log && exit 1)
 
 script:
-  - if [ "${CC}"  = "clang" ]; then export FLAGS="$FLAGS USE_OBSOLETE_LINKER=1" DEBUG_CFLAGS="-g -fsanitize=address" LDFLAGS="-fsanitize=address"; fi
   - make -C contrib/wurfl
   - make -j3 CC=$CC V=1 TARGET=$TARGET $FLAGS DEBUG_CFLAGS="$DEBUG_CFLAGS" LDFLAGS="$LDFLAGS" 51DEGREES_SRC="$FIFTYONEDEGREES_SRC" EXTRA_OBJS="$EXTRA_OBJS"
   - if [ "${TRAVIS_OS_NAME}" = "linux" ]; then export LD_LIBRARY_PATH="${HOME}/opt/lib:${LD_LIBRARY_PATH:-}"; fi