Rewrite to use test to make old mac sh versions happy

Author: ColtonWilley

scripts/external.test

@@ -21,11 +21,11 @@ fi
 # Not defining WOLFSSL_EXTERNAL_TEST runs only opt out.
 # Defining WOLFSSL_EXTERNAL_TEST!=0 runs opt out and opt in.
 # Defining WOLFSSL_EXTERNAL_TEST=0  does not run opt in or opt out.
-if [[ ! -v WOLFSSL_EXTERNAL_TEST ]]; then
+if ! test -n "$WOLFSSL_EXTERNAL_TEST"; then
     echo "WOLFSSL_EXTERNAL_TEST not set, won't run"
     exit 77
 fi
-if [[ "$WOLFSSL_EXTERNAL_TEST" == "0" ]]; then
+if test "$WOLFSSL_EXTERNAL_TEST" == "0"; then
     echo "WOLFSSL_EXTERNAL_TEST is defined to zero, won't run"
     exit 77
 fi

scripts/google.test

@@ -12,11 +12,11 @@ server=www.google.com
 # Not defining WOLFSSL_EXTERNAL_TEST runs only opt out.
 # Defining WOLFSSL_EXTERNAL_TEST!=0 runs opt out and opt in.
 # Defining WOLFSSL_EXTERNAL_TEST=0  does not run opt in or opt out.
-if [[ ! -v WOLFSSL_EXTERNAL_TEST ]]; then
+if ! test -n "$WOLFSSL_EXTERNAL_TEST"; then
     echo "WOLFSSL_EXTERNAL_TEST not set, won't run"
     exit 77
 fi
-if [[ "$WOLFSSL_EXTERNAL_TEST" == "0" ]]; then
+if test "$WOLFSSL_EXTERNAL_TEST" == "0"; then
     echo "WOLFSSL_EXTERNAL_TEST is defined to zero, won't run"
     exit 77
 fi

scripts/ocsp-stapling.test

@@ -17,7 +17,7 @@ fi
 # Not defining WOLFSSL_EXTERNAL_TEST runs only opt out.
 # Defining WOLFSSL_EXTERNAL_TEST!=0 runs opt out and opt in.
 # Defining WOLFSSL_EXTERNAL_TEST=0  does not run opt in or opt out.
-if [[ "$WOLFSSL_EXTERNAL_TEST" == "0" ]]; then
+if test "$WOLFSSL_EXTERNAL_TEST" == "0"; then
     echo 'skipping oscp-stapling.test because WOLFSSL_EXTERNAL_TEST is \
     defined to the value 0.'
     exit 77