[evolution] Bug 741034 - Use portable shell in configure.ac

[Milan Crha <mcrha src gnome org>]

commit 9485fd79605c0029f9ec51fe0307776102d4f4f1
Author: Alexander Tsoy <alexander tsoy me>
Date:   Mon Jan 5 14:49:02 2015 +0100

    Bug 741034 - Use portable shell in configure.ac

 configure.ac |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 453afad..a2148ab 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1058,7 +1058,7 @@ msg_bogofilter="$enable_bogofilter"
 if test "x$enable_bogofilter" = "xyes"; then
        AC_ARG_VAR([BOGOFILTER], [Bogofilter spam filtering program])
        AC_PATH_PROG([BOGOFILTER], [bogofilter])
-       if test "x$BOGOFILTER" == "x"; then
+       if test "x$BOGOFILTER" = "x"; then
                AC_MSG_ERROR([
 
        Bogofilter spam filtering program not found.
@@ -1088,7 +1088,7 @@ msg_spamassassin="$enable_spamassassin"
 if test "x$enable_spamassassin" = "xyes"; then
        AC_ARG_VAR([SPAMASSASSIN], [SpamAssassin spam filtering program])
        AC_PATH_PROG([SPAMASSASSIN], [spamassassin])
-       if test "x$SPAMASSASSIN" == "x"; then
+       if test "x$SPAMASSASSIN" = "x"; then
                AC_MSG_ERROR([
 
        SpamAssassin spam filtering program not found.
@@ -1310,7 +1310,7 @@ msg_text_highlight="$enable_text_highlight"
 if test "x$enable_text_highlight" = "xyes"; then
        AC_ARG_VAR([HIGHLIGHT], [Source code highlighting utility])
        AC_PATH_PROG([HIGHLIGHT], [highlight])
-       if test "x$HIGHLIGHT" == "x"; then
+       if test "x$HIGHLIGHT" = "x"; then
                AC_MSG_ERROR([
 
        Highlight utility not found.