librsvg: enable pixbuf loader

Requirement for https://github.com/termux/x11-packages/issues/139.

packages/librsvg/build.sh

@@ -2,12 +2,16 @@ TERMUX_PKG_HOMEPAGE=https://wiki.gnome.org/action/show/Projects/LibRsvg
 TERMUX_PKG_DESCRIPTION="Library to render SVG files using cairo"
 TERMUX_PKG_LICENSE="LGPL-2.0"
 TERMUX_PKG_VERSION=2.46.4
+TERMUX_PKG_REVISION=1
 TERMUX_PKG_SRCURL=http://ftp.gnome.org/pub/GNOME/sources/librsvg/${TERMUX_PKG_VERSION:0:4}/librsvg-${TERMUX_PKG_VERSION}.tar.xz
 TERMUX_PKG_SHA256=b45b9ee3b64c58baaf800bcdff5fcd04d79930dba4c56e46e0d3b0aead40cc29
 TERMUX_PKG_DEPENDS="gdk-pixbuf, libcairo, libcroco, pango, zlib"
 TERMUX_PKG_BREAKS="librsvg-dev"
 TERMUX_PKG_REPLACES="librsvg-dev"
-TERMUX_PKG_EXTRA_CONFIGURE_ARGS="--disable-introspection --disable-pixbuf-loader"
+TERMUX_PKG_EXTRA_CONFIGURE_ARGS="
+ac_cv_path_GDK_PIXBUF_QUERYLOADERS=$TERMUX_PREFIX/bin/gdk-pixbuf-query-loaders
+--disable-introspection
+"
 
 termux_step_pre_configure() {
 	termux_setup_rust

packages/librsvg/no-pixbuf-loaders-cache.patch

@@ -0,0 +1,37 @@
+diff -uNr librsvg-2.46.4/gdk-pixbuf-loader/Makefile.am librsvg-2.46.4.mod/gdk-pixbuf-loader/Makefile.am
+--- librsvg-2.46.4/gdk-pixbuf-loader/Makefile.am	2019-08-22 10:39:24.000000000 +0300
++++ librsvg-2.46.4.mod/gdk-pixbuf-loader/Makefile.am	2020-01-13 23:51:44.231919334 +0200
+@@ -47,10 +47,7 @@
+ 	$(AM_LDFLAGS)
+ rsvg_loader_LDADD = \
+ 	$(GDK_PIXBUF_LIBS)
+-EXTRA_rsvg_loader_DEPENDENCIES = libpixbufloader-svg.la gdk-pixbuf-loaders
+-
+-gdk-pixbuf-loaders: Makefile
+-	$(AM_V_GEN) ( $(GDK_PIXBUF_QUERYLOADERS) ./libpixbufloader-svg.la && $(GDK_PIXBUF_QUERYLOADERS)) > gdk-pixbuf.loaders 2>/dev/null
++EXTRA_rsvg_loader_DEPENDENCIES = libpixbufloader-svg.la
+ 
+ if CROSS_COMPILING
+ RUN_QUERY_LOADER_TEST=false
+diff -uNr librsvg-2.46.4/gdk-pixbuf-loader/Makefile.in librsvg-2.46.4.mod/gdk-pixbuf-loader/Makefile.in
+--- librsvg-2.46.4/gdk-pixbuf-loader/Makefile.in	2019-11-21 18:53:18.000000000 +0200
++++ librsvg-2.46.4.mod/gdk-pixbuf-loader/Makefile.in	2020-01-13 23:52:08.176024176 +0200
+@@ -483,7 +483,7 @@
+ @ENABLE_PIXBUF_LOADER_TRUE@rsvg_loader_LDADD = \
+ @ENABLE_PIXBUF_LOADER_TRUE@	$(GDK_PIXBUF_LIBS)
+ 
+-@ENABLE_PIXBUF_LOADER_TRUE@EXTRA_rsvg_loader_DEPENDENCIES = libpixbufloader-svg.la gdk-pixbuf-loaders
++@ENABLE_PIXBUF_LOADER_TRUE@EXTRA_rsvg_loader_DEPENDENCIES = libpixbufloader-svg.la
+ @CROSS_COMPILING_FALSE@@ENABLE_PIXBUF_LOADER_TRUE@RUN_QUERY_LOADER_TEST = test -z "$(DESTDIR)"
+ @CROSS_COMPILING_TRUE@@ENABLE_PIXBUF_LOADER_TRUE@RUN_QUERY_LOADER_TEST = false
+ @ENABLE_PIXBUF_LOADER_TRUE@thumbnailerdir = $(datadir)/thumbnailers/
+@@ -894,9 +894,6 @@
+ .PRECIOUS: Makefile
+ 
+ 
+-@ENABLE_PIXBUF_LOADER_TRUE@gdk-pixbuf-loaders: Makefile
+-@ENABLE_PIXBUF_LOADER_TRUE@	$(AM_V_GEN) ( $(GDK_PIXBUF_QUERYLOADERS) ./libpixbufloader-svg.la && $(GDK_PIXBUF_QUERYLOADERS)) > gdk-pixbuf.loaders 2>/dev/null
+-
+ # The following bit is stolen from gdk-pixbuf/gdk-pixbuf/Makefile.am:
+ #
+ # Running this if cross compiling or if DESTDIR is set is going to