[Patch/Gtk3] properly detect html-to-text conversion helper

[Albrecht Dreß <albrecht dress arcor de>]

Hi all,

Jack detected a bug in the configure script, erroneously setting a #define in config.h to an empty string 
instead of undef'ing it when no external html-to-text conversion helper could be found.  The attached patch 
fixes it.

Best,
Albrecht.

diff --git a/configure.ac b/configure.ac
index d6fe7c5..756a02b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -361,9 +361,9 @@ case "$use_html_widget" in
                        html2markdown.py2 \
                        html2markdown.py3 \
                        html2text],
-                      no)
-        if test x"$ac_cv_path_HTML2TEXT" != "xno" ; then
-            AC_DEFINE_UNQUOTED(HTML2TEXT, "$ac_cv_path_HTML2TEXT",
+                      [no])
+        if test x"$HTML2TEXT" != "xno" ; then
+            AC_DEFINE_UNQUOTED(HTML2TEXT, "$HTML2TEXT",
                                [Path to html2text program.])
                else
                        AC_MSG_WARN([You cannot properly quote html-only messags.])

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