fix condition

build/azure-pipelines/linux/product-build-linux.yml

@@ -78,12 +78,11 @@ steps:
 
   - script: |
       set -e
-      if [ -z "$CC" || -z "$CXX" ]
+      if [ -z "$CC" ] || [ -z "$CXX" ]
       then
         export CC=$(which gcc-5)
         export CXX=$(which g++-5)
       fi
-      echo $CXX
       export npm_config_arch=$(NPM_ARCH)
       export CHILD_CONCURRENCY="1"
       for i in {1..3}; do # try 3 times, for Terrapin

build/azure-pipelines/product-compile.yml

@@ -72,7 +72,7 @@ steps:
 
   - script: |
       set -e
-      if [ -z "$CC" || -z "$CXX" ]
+      if [ -z "$CC" ] || [ -z "$CXX" ]
       then
         export CC=$(which gcc-5)
         export CXX=$(which g++-5)