tweak makevars to remove -std c++11 as it fails BiocCheck

Author: MikeDMorgan

src/Makevars

@@ -2,7 +2,7 @@
 #CXX11STD = CXX11
 ## remove c++std11?
 #PKG_CXXFLAGS = $(CFLAGS) $(CXX11STD) $(SHLIB_OPENMP_CXXFLAGS)
-PKG_CXXFLAGS = $(CFLAGS) $(SHLIB_OPENMP_CXXFLAGS) -std=c++11
+PKG_CXXFLAGS = $(CFLAGS) $(SHLIB_OPENMP_CXXFLAGS) $(CXXFLAGS)
 PKG_LIBS = $(LAPACK_LIBS) $(BLAS_LIBS) $(FLIBS) $(SHLIB_OPENMP_CXXFLAGS)
 ALL_CXXFLAGS = $(R_XTRA_CXXFLAGS) $(PKG_CXXFLAGS) $(CXXPICFLAGS) $(SHLIB_CXXFLAGS) $(CXXFLAGS)
 #PKG_CPPFLAGS = -I../inst/include -I./OsqpEigen/include -I./osqp/include/public -I./osqp/include/private