Remove Travis check in depends toolchain file

The architecture for darwin is now detected correctly, remove the
override for it.

.travis.yml

@@ -58,7 +58,7 @@ script:
     - export TRAVIS_COMMIT_LOG=`git log --format=fuller -1`
     - OUTDIR=$BASE_OUTDIR/$TRAVIS_PULL_REQUEST/$TRAVIS_JOB_NUMBER-$HOST
     - if [ -z "$NO_DEPENDS" ]; then $DOCKER_EXEC ccache --max-size=$CCACHE_SIZE; fi
-    - $DOCKER_EXEC bash -c "mkdir build && cd build && cmake -DCMAKE_TOOLCHAIN_FILE=$TRAVIS_BUILD_DIR/contrib/depends/$HOST/share/toolchain.cmake -DTRAVIS=true .. && make $MAKEJOBS"
+    - $DOCKER_EXEC bash -c "mkdir build && cd build && cmake -DCMAKE_TOOLCHAIN_FILE=$TRAVIS_BUILD_DIR/contrib/depends/$HOST/share/toolchain.cmake .. && make $MAKEJOBS"
     - export LD_LIBRARY_PATH=$TRAVIS_BUILD_DIR/contrib/depends/$HOST/lib
 after_script:
     - echo $TRAVIS_COMMIT_RANGE

contrib/depends/toolchain.cmake.in

@@ -51,9 +51,6 @@ if(CMAKE_SYSTEM_NAME STREQUAL "Darwin")
   SET(APPLE True)
   SET(BUILD_TAG "mac-x64")
   SET(BUILD_64 ON)
-  if(NOT TRAVIS)
-  SET(ARCH "x86_64")
-  endif()
   SET(BREW OFF)
   SET(PORT OFF)
   SET(CMAKE_OSX_SYSROOT "@sdk@/MacOSX10.11.sdk/")