Pass in ARROW_TEST_INCLUDE_LABELS via environment variable

Change-Id: Ia3c4adff7a83babeacc45ecf6ce650894c56db2d

.travis.yml

@@ -111,6 +111,8 @@ matrix:
     - ARROW_TRAVIS_GANDIVA=1
     - ARROW_TRAVIS_OPTIONAL_INSTALL=1
     - ARROW_CPP_BUILD_TARGETS="gandiva"
+    # TODO(wesm): Remove this after ARROW-4026
+    - ARROW_TRAVIS_CPP_TEST_INCLUDE_LABELS="gandiva"
     - ARROW_TRAVIS_USE_TOOLCHAIN=1
     # ARROW-3979 temporarily disabled.
     - ARROW_TRAVIS_VALGRIND=0
@@ -159,6 +161,8 @@ matrix:
     - ARROW_TRAVIS_GANDIVA=1
     - ARROW_TRAVIS_OPTIONAL_INSTALL=1
     - ARROW_CPP_BUILD_TARGETS="gandiva"
+    # TODO(wesm): Remove this after ARROW-4026
+    - ARROW_TRAVIS_CPP_TEST_INCLUDE_LABELS="gandiva"
     - ARROW_TRAVIS_USE_TOOLCHAIN=1
     - ARROW_BUILD_WARNING_LEVEL=CHECKIN
     before_script:

ci/travis_before_script_cpp.sh

@@ -42,6 +42,7 @@ fi
 
 CMAKE_COMMON_FLAGS="\
 -DCMAKE_INSTALL_PREFIX=$ARROW_CPP_INSTALL \
+-DARROW_TEST_INCLUDE_LABELS=$ARROW_TRAVIS_CPP_TEST_INCLUDE_LABELS \
 -DARROW_NO_DEPRECATED_API=ON \
 -DARROW_EXTRA_ERROR_CONTEXT=ON"
 CMAKE_LINUX_FLAGS=""