Fix typo in configure script when checking for mod_so. bash

doesn't seem to have a problem but /bin/sh on Solaris does.
Symptom: "./configure: test: unknown operator =="


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@85434 13f79535-47bb-0310-9956-ffa450edef68

acinclude.m4

@@ -316,8 +316,7 @@ AC_DEFUN(APACHE_MODULE,[
       shared=yes;;
     *)
       MODLIST="$MODLIST ifelse($4,,$1,$4)"
-      if test "$1" == "so"; then
-          echo "so"
+      if test "$1" = "so"; then
           sharedobjs=yes
       fi
       shared="";;