travis: fix rpath

.travis.yml

@@ -41,7 +41,7 @@ before_script:
   - if [ "$TRAVIS_OS_NAME" == "osx" ]; then brew install libev; fi
   # configure ngtcp2
   - if [ "$CI_BUILD" == "autotools" ]; then autoreconf -i; fi
-  - export PKG_CONFIG_PATH=$PWD/../openssl/build/lib/pkgconfig LDFLAGS="$EXTRA_LDFLAGS -Wl,-rpath,$PWD/openssl/build/lib"
+  - export PKG_CONFIG_PATH=$PWD/../openssl/build/lib/pkgconfig LDFLAGS="$EXTRA_LDFLAGS -Wl,-rpath,$PWD/../openssl/build/lib"
   - if [ "$CI_BUILD" == "autotools" ]; then ./configure --enable-werror --enable-asan; fi
   # Set CMAKE_LIBRARY_ARCHITECTURE to workaround failure to parse implicit link information from GCC 5
   - if [ "$CI_BUILD" == "cmake" ]; then cmake -DENABLE_ASAN=1 -DCMAKE_LIBRARY_ARCHITECTURE=x86_64-linux-gnu; fi