Adjust ghostscript to build libgs for upcoming libspectre

Signed-off-by: Andreas Müller <schnitzeltony@gmail.com>

extends-oe-core/ghostscript%.bbappend

@@ -0,0 +1,20 @@
+DEPENDS:append:class-target = " libidn"
+
+EXTRA_OECONF:remove:class-target = "--without-libidn"
+
+do_configure:append:class-target() {
+    # more (so) copy tools from the native ghostscript build
+    mkdir -p soobj/aux
+    for i in genarch genconf mkromfs echogs gendev genht packps; do
+        cp -f ${STAGING_BINDIR_NATIVE}/ghostscript-${PV}/$i soobj/aux/$i
+    done
+}
+
+do_compile:class-target() {
+    oe_runmake so
+}
+
+do_install:class-target() {
+    oe_runmake 'DESTDIR=${D}' soinstall
+    mv -f ${D}${bindir}/gsc ${D}${bindir}/gs
+}