use /bin/mail instead of /bin/mailx

/bin/mail is a symlink to /bin/mailx on Fedora and /usr/bin/mailx on openSUSE
but openSUSE misses /bin/mailx

Related #181

Signed-off-by: Jakub Filak <jfilak@redhat.com>

configure.ac

@@ -393,6 +393,12 @@ fi
 
 AM_CONDITIONAL(DOXYGEN_DOCS_ENABLED, test "$enable_doxygen_docs" = "yes")
 
+AC_ARG_WITH(mail,
+            [AS_HELP_STRING([--with-mail=PATH],
+                           [Path to mail executable (default: /bin/mail)])],
+            [], [with_mail="/bin/mail"])
+AC_SUBST([MAIL_EXE_PATH], [$with_mail])
+
 AC_SUBST(CONF_DIR)
 AC_SUBST(DEFAULT_CONF_DIR)
 AC_SUBST(VAR_RUN)

src/plugins/Makefile.am

@@ -273,6 +273,7 @@ reporter_mailx_CPPFLAGS = \
     -DDEBUG_INFO_DIR=\"$(DEBUG_INFO_DIR)\" \
     -DPLUGINS_LIB_DIR=\"$(PLUGINS_LIB_DIR)\" \
     -DPLUGINS_CONF_DIR=\"$(REPORT_PLUGINS_CONF_DIR)\" \
+    -DMAIL_EXE_PATH=\"$(MAIL_EXE_PATH)\" \
     $(GLIB_CFLAGS) \
     $(LIBREPORT_CFLAGS) \
     -D_GNU_SOURCE

src/plugins/reporter-mailx.c

@@ -97,7 +97,7 @@ static void create_and_send_email(
 
     char **args = NULL;
     unsigned arg_size = 0;
-    args = append_str_to_vector(args, &arg_size, "/bin/mailx");
+    args = append_str_to_vector(args, &arg_size, MAIL_EXE_PATH);
 
     char *dsc = make_description_mailx(problem_data, CD_TEXT_ATT_SIZE_LOGGER);