scripts: Add a test case for Ubuntu 18.04 compiler error

Attempt to detect a bad build of Klipper and report an error.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

scripts/check-gcc.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+# This script checks for a broken Ubuntu 18.04 arm-none-eabi-gcc compile
+
+f1="$1"
+f2="$2"
+
+s1=`readelf -A "$f1" | grep "Tag_ARM_ISA_use"`
+s2=`readelf -A "$f2" | grep "Tag_ARM_ISA_use"`
+
+if [ "$s1" != "$s2" ]; then
+    echo ""
+    echo "ERROR: The compiler failed to correctly compile Klipper"
+    echo "It will be necessary to upgrade the compiler"
+    echo "See: https://bugs.launchpad.net/ubuntu/+source/newlib/+bug/1767223"
+    echo ""
+    rm -f "$f1"
+    exit 99
+fi