[glom] Build: Use gtksourceviewmm-4.0 instead of gtksourceviewmm-3.0

[Murray Cumming <murrayc src gnome org>]

commit d0d3027c974fc1c5806d20f13930b03b9439a2fb
Author: Murray Cumming <murrayc murrayc com>
Date:   Tue Dec 4 13:56:01 2018 +0100

    Build: Use gtksourceviewmm-4.0 instead of gtksourceviewmm-3.0

 configure.ac | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/configure.ac b/configure.ac
index 1d6e7b84..dfb1f642 100644
--- a/configure.ac
+++ b/configure.ac
@@ -178,7 +178,7 @@ AS_IF([test "x$glom_enable_client_only" != xyes && test "x$glom_host_win32" != x
 
 # Do not require gtksourceviewmm in client only mode
 AS_IF([test "x$glom_enable_client_only" != xyes],
-      [REQUIRED_GLOM_LIBS="$REQUIRED_GLOM_LIBS gtksourceviewmm-3.0 >= 3.18.0"])
+      [REQUIRED_GLOM_LIBS="$REQUIRED_GLOM_LIBS gtksourceviewmm-4.0 >= 3.18.0"])
 
 AS_IF([test "x$glom_enable_sqlite" = xyes],
       [REQUIRED_GLOM_LIBS="$REQUIRED_GLOM_LIBS libgda-sqlite-5.0"])