Fix stripping and test it

tests/check-binary.sh

@@ -4,6 +4,7 @@ set -x
 TARGET=$1
 EXPECT_CROSS=$2
 EXPECT_FILE_RE=$3
+EXPECT_STRIPPED=$4
 
 if [ "$EXPECT_CROSS" == "true" ]; then
     if [ ! -f "$RUNNER_TEMP/cross" ]; then
@@ -24,3 +25,25 @@ else
     echo "file output does not match $EXPECT_FILE_RE"
     exit 2
 fi
+
+if [[ $( uname -s ) =~ "Darwin" ]]; then
+    # File on macOS doesn't report whether the binary is stripped or not.
+    exit 0
+fi
+
+if [[ "$FILE" =~ "not stripped" ]]; then
+    echo "binary was not stripped"
+    GOT_STRIPPED="false"
+elif [[ "$FILE" =~ "stripped" ]]; then
+    echo "binary was stripped"
+    GOT_STRIPPED="true"
+else
+    # On Windows the aarch64 binary's file info doesn't include the word
+    # "stripped" at all.
+    echo "binary was not stripped"
+    GOT_STRIPPED="false"
+fi
+
+if [ "$EXPECT_STRIPPED" != "$GOT_STRIPPED" ]; then
+    exit 3
+fi