[gnome-builder] build: require vala 0.38

[Christian Hergert <chergert src gnome org>]

commit 0c4c950b6ca1e288b0245f41872afc2e941a563a
Author: Christian Hergert <chergert redhat com>
Date:   Tue Apr 18 13:52:53 2017 -0700

    build: require vala 0.38
    
    This probably means we can simplify some code in the vala-pack plugin too.

 plugins/vala-pack/configure.ac |    8 ++++++--
 plugins/vala-pack/meson.build  |    1 +
 2 files changed, 7 insertions(+), 2 deletions(-)
---
diff --git a/plugins/vala-pack/configure.ac b/plugins/vala-pack/configure.ac
index ae92e11..80328aa 100644
--- a/plugins/vala-pack/configure.ac
+++ b/plugins/vala-pack/configure.ac
@@ -1,6 +1,10 @@
 VAPIGEN_CHECK
-PKG_CHECK_MODULES(VALA, [libvala-0.36],[have_libvala=yes],[have_libvala=no])
-VALA_VERSION=0.36
+PKG_CHECK_MODULES(VALA, [libvala-0.38],[have_libvala=yes],[have_libvala=no])
+VALA_VERSION=0.38
+AS_IF([test x$have_libvala = xno],[
+       PKG_CHECK_MODULES(VALA, [libvala-0.36],[have_libvala=yes],[have_libvala=no])
+       VALA_VERSION=0.36
+])
 AS_IF([test x$have_libvala = xno],[
        PKG_CHECK_MODULES(VALA, [libvala-0.34],[have_libvala=yes],[have_libvala=no])
        VALA_VERSION=0.34
diff --git a/plugins/vala-pack/meson.build b/plugins/vala-pack/meson.build
index 2e667b0..8cfe02f 100644
--- a/plugins/vala-pack/meson.build
+++ b/plugins/vala-pack/meson.build
@@ -7,6 +7,7 @@ endif
 add_languages('vala')
 
 libvala_options = [
+  ['libvala-0.38', ''],
   ['libvala-0.36', ''],
   ['libvala-0.34', ''],
   ['libvala-0.32', ''],