travis: Remove sparse support.

"sparse" failed to build with this old branch, see e.g.
https://travis-ci.org/openvswitch/ovs/jobs/436851158

Signed-off-by: Ben Pfaff <blp@ovn.org>

.travis/build.sh

@@ -4,7 +4,6 @@ set -o errexit
 
 KERNELSRC=""
 CFLAGS="-Werror"
-SPARSE_FLAGS=""
 EXTRA_OPTS=""
 
 function install_kernel()
@@ -77,9 +76,6 @@ if [ "$DPDK" ]; then
         CFLAGS="$CFLAGS -Wno-cast-align"
     fi
     EXTRA_OPTS="$EXTRA_OPTS --with-dpdk=./dpdk-$DPDK_VER/build"
-elif [ "$CC" != "clang" ]; then
-    # DPDK headers currently trigger sparse errors
-    SPARSE_FLAGS="$SPARSE_FLAGS -Wsparse-error"
 fi
 
 configure_ovs $EXTRA_OPTS $*
@@ -91,11 +87,8 @@ fi
 
 if [ "$CC" = "clang" ]; then
     make CFLAGS="$CFLAGS -Wno-error=unused-command-line-argument"
-elif [[ $BUILD_ENV =~ "-m32" ]]; then
-    # Disable sparse for 32bit builds on 64bit machine
-    make CFLAGS="$CFLAGS $BUILD_ENV"
 else
-    make CFLAGS="$CFLAGS $BUILD_ENV $SPARSE_FLAGS" C=1
+    make CFLAGS="$CFLAGS $BUILD_ENV"
 fi
 
 if [ "$TESTSUITE" ] && [ "$CC" != "clang" ]; then

.travis/prepare.sh

@@ -1,4 +1,3 @@
 #!/bin/bash
 
-git clone git://git.kernel.org/pub/scm/devel/sparse/chrisl/sparse.git
-cd sparse && make && make install && cd ..
+