harfbuzz: check in harfbuzz-ng, add gyp define to use it

third_party/harfbuzz-ng/src/check-libstdc++.sh

Index: third_party/harfbuzz-ng/src/check-libstdc++.sh
diff --git a/third_party/harfbuzz-ng/src/check-libstdc++.sh b/third_party/harfbuzz-ng/src/check-libstdc++.sh
new file mode 100755
index 0000000000000000000000000000000000000000..c0abcbe41343341167b050016adb4d4edd1c6a28
--- /dev/null
+++ b/third_party/harfbuzz-ng/src/check-libstdc++.sh
@@ -0,0 +1,27 @@
+#!/bin/sh
+
+LC_ALL=C
+export LC_ALL
+
+if which ldd 2>/dev/null >/dev/null; then
+	:
+else
+	echo "check-libstdc++.sh: 'ldd' not found; skipping test"
+	exit 0
+fi
+
+test -z "$srcdir" && srcdir=.
+stat=0
+
+so=.libs/libharfbuzz.so
+if test -f "$so"; then
+	echo "Checking that we are not linking to libstdc++"
+	if ldd $so | grep 'libstdc[+][+]'; then
+		echo "Ouch, linked to libstdc++"
+		stat=1
+	fi
+else
+	echo "check-libstdc++.sh: libharfbuzz.so not found; skipping test"
+fi
+
+exit $stat