Improved test to also check system library includes

Author: piranna

resources/dummy.c

@@ -0,0 +1,3 @@
+#include <ctype.h>
+
+main(){}

scripts/test

@@ -8,11 +8,13 @@ LIBC="/lib/ld-musl-$CPU_PORT.so.1"
 PATH=`pwd`/bin:$PATH
 
 (
-  mkdir -p build &&
-  cd       build || exit 1
+  mkdir -p build || exit 1
 
-  echo 'main(){}' > dummy.c                || exit 2
-  $TARGET-gcc dummy.c                      || exit 3
-  $TARGET-readelf -l a.out | grep -q $LIBC || exit 4
-  rm dummy.c a.out                         || exit 5
+  cp resources/dummy.c build || exit 2
+
+  cd build || exit 3
+
+  $TARGET-gcc dummy.c                      || exit 4
+  $TARGET-readelf -l a.out | grep -q $LIBC || exit 5
+  rm dummy.c a.out                         || exit 6
 ) || exit $?