[hitori] build: Eliminate a bash-ism in check-builder

[Philip Withnall <pwithnall src gnome org>]

commit a3b56b28d74545284c35f925e493046acdb37876
Author: Philip Withnall <philip tecnocode co uk>
Date:   Tue Feb 14 23:07:17 2017 +0000

    build: Eliminate a bash-ism in check-builder
    
    Signed-off-by: Philip Withnall <philip tecnocode co uk>

 Makefile.am |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/Makefile.am b/Makefile.am
index 7da5fad..53e77ad 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -93,7 +93,7 @@ dist_noinst_DATA = \
        data/hitori.css
 
 check-builder: $(ui_data)
-       [ "$(XMLLINT)" == "" ] || \
+       [ "$(XMLLINT)" = "" ] || \
        $(XMLLINT) --nonet --noblanks --noout --relaxng $(GTK_PREFIX)/share/gtk-3.0/gtkbuilder.rng $^
 check-local: check-builder