[pango] Add a valgrind suppression file

[Matthias Clasen <matthiasc src gnome org>]

commit 7ac8f4890b104f166e2e00d61924ae1deaed1313
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Jan 23 20:08:19 2021 -0500

    Add a valgrind suppression file
    
    Suggested by Philip Withnall.
    
    Fixes: #415

 pango.supp | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
---
diff --git a/pango.supp b/pango.supp
new file mode 100644
index 00000000..6c7b4d1a
--- /dev/null
+++ b/pango.supp
@@ -0,0 +1,86 @@
+# Pango
+{
+   pango 1
+   Memcheck:Leak
+   match-leak-kinds: definite
+   fun:realloc
+   obj:/usr/lib*/libfontconfig.so*
+   obj:/usr/lib*/libfontconfig.so*
+   obj:/usr/lib*/libcairo.so*
+   fun:pango_cairo_fc_font_map_fontset_key_substitute
+}
+
+{
+  pango 2
+  Memcheck:Leak
+  fun:realloc
+  obj:/usr/lib*/libfontconfig.so*
+  obj:/usr/lib*/libfontconfig.so*
+  fun:_cairo_ft_font_options_substitute
+}
+
+# Fontconfig
+{
+   FcFontSetList
+   Memcheck:Leak
+   match-leak-kinds: definite
+   fun:malloc
+   obj:/usr/lib*/libfontconfig.so*
+   obj:/usr/lib*/libfontconfig.so*
+   fun:FcFontSetList
+}
+
+{
+   FcPatternObjectInsertElt
+   Memcheck:Leak
+   match-leak-kinds: definite
+   fun:malloc
+   fun:FcPatternObjectInsertElt
+}
+
+{
+   FcFontRenderPrepare
+   Memcheck:Leak
+   match-leak-kinds: definite
+   fun:realloc
+   obj:/usr/lib*/libfontconfig.so*
+   obj:/usr/lib*/libfontconfig.so*
+   fun:FcFontRenderPrepare
+}
+
+{
+   FcDefaultSubstitute
+   Memcheck:Leak
+   match-leak-kinds: definite
+   fun:realloc
+   obj:/usr/lib*/libfontconfig.so*
+   obj:/usr/lib*/libfontconfig.so*
+   fun:FcDefaultSubstitute
+}
+
+# Pixman
+{
+   pixman_image_composite32
+   Memcheck:Cond
+   obj:/usr/lib*/libpixman-1.so*
+   obj:/usr/lib*/libpixman-1.so*
+   fun:pixman_image_composite32
+}
+
+# GLib
+{
+  glib GQuark
+  Memcheck:Leak
+  match-leak-kinds: definite
+  fun:malloc
+  ...
+  fun:g_quark_*
+}
+{
+  glib GQuark
+  Memcheck:Leak
+  match-leak-kinds: definite
+  fun:malloc
+  ...
+  fun:g_intern_static_string
+}