Revert "[wip/{,py-}sot-talos-balance] build in C++11"

This reverts commit f88b89e3.

Because this package already defines CMAKE_CXX_STANDARD to 11.

py-sot-talos-balance/Makefile

@@ -43,5 +43,5 @@ include ../../mk/sysdep/graphviz.mk
 include ../../mk/sysdep/py-sphinx.mk
 include ../../mk/sysdep/python.mk
 include ../../mk/language/c.mk
-include ../../mk/language/c++11.mk
+include ../../mk/language/c++.mk
 include ../../mk/robotpkg.mk

sot-talos-balance/Makefile

@@ -34,5 +34,5 @@ include ../../mk/sysdep/cmake.mk
 include ../../mk/sysdep/doxygen.mk
 include ../../mk/sysdep/graphviz.mk
 include ../../mk/language/c.mk
-include ../../mk/language/c++11.mk
+include ../../mk/language/c++.mk
 include ../../mk/robotpkg.mk