[gtksourceview] build: bump g-i requirement to 1.42.0 for properly build vala bindings

[Sébastien Wilmet <swilmet src gnome org>]

commit 78e317234879d0c3f6ceed4a62b51cd8776a1a0f
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Tue Nov 18 18:13:07 2014 +0100

    build: bump g-i requirement to 1.42.0 for properly build vala bindings
    
    For the nullable annotations.
    
    Reviewed-by: Sébastien Wilmet

 configure.ac |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 7374193..62a9abc 100644
--- a/configure.ac
+++ b/configure.ac
@@ -158,7 +158,7 @@ AC_SUBST(PANGO_PREFIX)
 AC_SUBST(GDK_PIXBUF_PREFIX)
 
 # Introspection
-GOBJECT_INTROSPECTION_CHECK([0.9.0])
+GOBJECT_INTROSPECTION_CHECK([1.42.0])
 
 # Code coverage
 GNOME_CODE_COVERAGE