[vte] build: vala: Fix check for valac >= 0.31.1

[Christian Persch <chpe src gnome org>]

commit 049e0bbc9807311edac246427f3f1f164f60c2da
Author: Christian Persch <chpe src gnome org>
Date:   Wed Apr 26 11:21:41 2017 +0200

    build: vala: Fix check for valac >= 0.31.1
    
    Need to always check this, since we build (but not install) the
    test application when --enable-vala is given.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=781720

 configure.ac |   17 ++++++-----------
 1 files changed, 6 insertions(+), 11 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 5fe80dc..b5e3f6d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -388,24 +388,19 @@ m4_ifdef([VAPIGEN_CHECK],
 # Test Application
 # ****************
 
-AC_MSG_CHECKING([whether to build the test application])
+AC_MSG_CHECKING([whether to install the vala test application])
 AC_ARG_ENABLE([test-application],
-        [AS_HELP_STRING([--disable-test-application],[Disable test application])],
+        [AS_HELP_STRING([--disable-test-application],[Disable installing the vala test application])],
         [],[enable_test_application=$enable_vala])
 AC_MSG_RESULT([$enable_test_application])
 
 AM_PROG_VALAC([0.24.0],[],[
-  if test "$enable_test_application" != "no"; then
-    AC_MSG_ERROR([vala support enabled by vala compiler not found])
+  if test "$enable_vala" != "no"; then
+    AC_MSG_ERROR([Vala requested but vala compiler >= 0.24.0 not found])
   fi])
 
-if test "$enable_test_application" = "yes"; then
-  PKG_CHECK_MODULES([GTK_3_16],[gtk+-$GTK_API_VERSION >= 3.16],[have_gtk_3_16=yes],[have_gtk_3_16=no])
-  AM_PROG_VALAC([0.31.1],[have_vala_0_31=yes],[have_vala_0_31=no])
-else
-  have_gtk_3_16=no
-  have_vala_0_31=no
-fi
+PKG_CHECK_MODULES([GTK_3_16],[gtk+-$GTK_API_VERSION >= 3.16],[have_gtk_3_16=yes],[have_gtk_3_16=no])
+AM_PROG_VALAC([0.31.1],[have_vala_0_31=yes],[have_vala_0_31=no])
 
 AM_CONDITIONAL([ENABLE_TEST_APPLICATION],[test "$enable_test_application" = "yes"])
 AM_CONDITIONAL([HAVE_GTK_3_16],[test "$have_gtk_3_16" = "yes"])