component/ghostscript: build with libidn

without libidn, decrypting password protected PDFs does not fully work.

component/ghostscript/buildout.cfg

@@ -2,6 +2,7 @@
 extends =
   ../fontconfig/buildout.cfg
   ../freetype/buildout.cfg
+  ../libidn/buildout.cfg
   ../libjpeg/buildout.cfg
   ../libtiff/buildout.cfg
   ../libxml2/buildout.cfg
@@ -16,13 +17,12 @@ recipe = slapos.recipe.cmmi
 shared = true
 url = https://github.com/ArtifexSoftware/ghostpdl-downloads/releases/download/gs10020/ghostscript-10.02.0.tar.xz
 md5sum = 80c1cdfada72f2eb5987dc0d590ea5b2
-pkg_config_depends = ${libtiff:location}/lib/pkgconfig:${libjpeg:location}/lib/pkgconfig:${fontconfig:location}/lib/pkgconfig:${fontconfig:pkg_config_depends}
+pkg_config_depends = ${libidn:location}/lib/pkgconfig:${libtiff:location}/lib/pkgconfig:${libjpeg:location}/lib/pkgconfig:${fontconfig:location}/lib/pkgconfig:${fontconfig:pkg_config_depends}
 # XXX --with-tessdata work arounds a slaprunner bug of having softwares installed in a path containing //
 configure-options =
   --disable-cups
   --disable-threadsafe
   --with-system-libtiff
-  --without-libidn
   --without-so
   --without-x
   --with-drivers=FILES
@@ -31,8 +31,8 @@ environment =
   PATH=${pkgconfig:location}/bin:${xz-utils:location}/bin:%(PATH)s
   PKG_CONFIG_PATH=${:pkg_config_depends}
   CFLAGS=-I${libjpeg:location}/include
-  LDFLAGS=-Wl,-rpath=${fontconfig:location}/lib -Wl,-rpath=${freetype:location}/lib -Wl,-rpath=${libtiff:location}/lib -L${libjpeg:location}/lib -Wl,-rpath=${libjpeg:location}/lib
-  LD_LIBRARY_PATH=${fontconfig:location}/lib:${freetype:location}/lib:${libtiff:location}/lib:${libxml2:location}/lib
+  LDFLAGS=-Wl,-rpath=${libidn:location}/lib -Wl,-rpath=${fontconfig:location}/lib -Wl,-rpath=${freetype:location}/lib -Wl,-rpath=${libtiff:location}/lib -L${libjpeg:location}/lib -Wl,-rpath=${libjpeg:location}/lib
+  LD_LIBRARY_PATH=${libidn:location}/lib:${fontconfig:location}/lib:${freetype:location}/lib:${libtiff:location}/lib:${libxml2:location}/lib
 
 # configure gives priority to local jpeg library and refuse mixing local libjpeg with "system" libtiff.
 # We remove this local jpeg library source folder so that configure picks up the slapos versions of these libraries.