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configure: test -std=c++11 before enabling unit tests

since:
77fa51003 Replace deprecated scoped_ptr with unique_ptr

the unit tests require a c++11 capable compiler; future versions of
googletest (1.9.x) will as well, so this change was inevitable if we
wanted to keep the snapshot up to date.

Change-Id: Id5c646bd10fae09e7b705b7d5fad1344f2216282

--- a/configure

+++ b/configure

@@ -730,18 +730,15 @@

             # Some mingw toolchains don't have pthread available by default.

             # Treat these more like visual studio where threading in gtest

             # would be disabled for the same reason.

-            check_cxx "$@" <<EOF && soft_enable unit_tests

-int z;

-EOF

-            check_add_cxxflags -std=c++11 && soft_enable webm_io

+            check_add_cxxflags -std=c++11 && soft_enable unit_tests \

+              && soft_enable webm_io

             check_cxx "$@" <<EOF && soft_enable libyuv

 int z;

 EOF

         ;;

         *)

-            enabled pthread_h && check_cxx "$@" <<EOF && soft_enable unit_tests

-int z;

-EOF

+            enabled pthread_h && check_add_cxxflags -std=c++11 \

+              && soft_enable unit_tests

             check_add_cxxflags -std=c++11 && soft_enable webm_io

             check_cxx "$@" <<EOF && soft_enable libyuv

 int z;