[balsa] configure: Accomodate Gentoo naming of enchant.pc

[Peter Bloomfield <peterb src gnome org>]

commit 632abbdae00e69fbe37ebe87b0d12ed5a48c1a64
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Tue Jul 24 08:39:14 2018 -0400

    configure: Accomodate Gentoo naming of enchant.pc
    
            * configure.ac: Change the pkg-config test for enchant from
              "<= 1.6.0" to "!= 1.6.1"; Gentoo provides enchant versions 2.x.x
              with enchant.pc, not enchant-2.pc.

 ChangeLog    | 6 ++++++
 configure.ac | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)
---
diff --git a/ChangeLog b/ChangeLog
index e5046970e..519eb1f51 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2018-07-24  Peter Bloomfield  <pbloomfield bellsouth net>
+
+       * configure.ac: Change the pkg-config test for enchant from
+         "<= 1.6.0" to "!= 1.6.1"; Gentoo provides enchant versions 2.x.x
+         with enchant.pc, not enchant-2.pc.
+
 2018-07-21  Peter Bloomfield  <pbloomfield bellsouth net>
 
        Oops, forgot this in the previous commit.
diff --git a/configure.ac b/configure.ac
index 65940c9a9..00947c67e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -575,7 +575,7 @@ case "$use_spell_checker" in
     if $PKG_CONFIG enchant-2 ; then
         PKG_CHECK_MODULES(SPELL, [ enchant-2 ])
     else
-        PKG_CHECK_MODULES(SPELL, [ enchant <= 1.6.0 ])
+        PKG_CHECK_MODULES(SPELL, [ enchant != 1.6.1 ])
     fi
     ;;
     *)