Disable running of sel_ldr arm tests on mac

ports/zlib/build.sh

Index: ports/zlib/build.sh
diff --git a/ports/zlib/build.sh b/ports/zlib/build.sh
index 4750888b9a0ca08c540d3af01e7119bcd40d9041..a2e6f77cfe758fc01dac93c1b5db140b288778da 100644
--- a/ports/zlib/build.sh
+++ b/ports/zlib/build.sh
@@ -54,11 +54,13 @@ RunExample() {
 TestStep() {
   RunExample
   RunMinigzip
-  if [ "${NACL_ARCH}" = "pnacl" ]; then
+  if [[ ${NACL_ARCH} == pnacl ]]; then
     # Run the minigzip tests again but with x86-32 and arm translations
     WriteLauncherScript minigzip minigzip.x86-32.nexe
     RunMinigzip
-    WriteLauncherScript minigzip minigzip.arm.nexe
-    RunMinigzip
+    if [[ ${SEL_LDR_SUPPORTS_ARM} == 1 ]]; then
+      WriteLauncherScript minigzip minigzip.arm.nexe
+      RunMinigzip
+    fi
   fi
 }