Remove duplicate specification of -Ae for HP-UX C compiler.

Autoconf has known about automatically selecting -Ae when needed for
quite some time now, so remove the redundant addition in template/hpux.
Noted while setting up buildfarm member pademelon.

src/template/hpux

 # src/template/hpux
 
+# Need this for access to many modern library features
 CPPFLAGS="$CPPFLAGS -D_XOPEN_SOURCE_EXTENDED"
 
+# HP's compiler likes the spelling +O2 not -O2, so adjust default CFLAGS
 if test "$GCC" != yes ; then
-  CC="$CC -Ae"
   CFLAGS="+O2"
 fi