make configure more robust if extensions add libraries without

checking for their existance first

old behaviour was to fail on the next library check with misleading
messages, now configure will work but make will fail with a
'lib not found' message

acinclude.m4

@@ -749,7 +749,7 @@ AC_DEFUN(PHP_ADD_LIBRARY,[
  c|c_r|pthread*) ;;
  *)
 ifelse($3,,[
-   PHP_X_ADD_LIBRARY($1,$2,LIBS)
+   PHP_X_ADD_LIBRARY($1,$2,PHP_EXTENSION_LIBS)
 ],[
    if test "$ext_shared" = "yes"; then
      PHP_X_ADD_LIBRARY($1,$2,$3)

configure.in

@@ -727,7 +727,7 @@ if test "$abs_srcdir" != "$abs_builddir"; then
   INCLUDES="$INCLUDES -I\$(top_srcdir)/TSRM"
 fi
 
-EXTRA_LIBS="$EXTRA_LIBS $DLIBS $LIBS"
+EXTRA_LIBS="$EXTRA_LIBS $DLIBS $LIBS $PHP_EXTENSION_LIBS"
 unset LIBS LDFLAGS
 
 PHP_CONFIGURE_PART(Configuring TSRM)