增加vendor导入target的依赖关系定义，避免在并行编译时因依赖关系得不到满足导致编译失败。

ci/travis.sh

@@ -19,6 +19,12 @@ if [ $NPROCESSORS -gt 4 ] ; then
 	NPROCESSORS=4
 fi
 
+# Tell make to use the processors. No preceding '-' required.
+MAKEFLAGS="j${NPROCESSORS}"
+export MAKEFLAGS
+
+env | sort
+
 # Set default values to OFF for these variables if not specified.
 : "${NO_EXCEPTION:=OFF}"
 : "${NO_RTTI:=OFF}"
@@ -30,7 +36,6 @@ export BUILD_TYPE=Debug
 
 cmake -DCMAKE_CXX_FLAGS=$CXX_FLAGS \
       -DCMAKE_BUILD_TYPE=$BUILD_TYPE \
-      -DTFE_BUILD_NPROCESSORS=$NPROCESSORS \
       ..
 make
 CTEST_OUTPUT_ON_FAILURE=1 make test