Minor edits / improvements to configure* and src/Makevars*

Author: eddelbuettel

configure

@@ -3299,7 +3299,7 @@ printf "%s\n" "yes, but without OpenMP as version ${gxx_version} (Armadillo cons
                  ## we know this one is bad
                  can_use_openmp="no"
             ;;
-            5.4*|5.5*|5.6*|5.7*|5.8*|5.9*|6.*|7.*|8.*|9.*|10.*|11.*|12.*)
+            5.4*|5.5*|5.6*|5.7*|5.8*|5.9*|6.*|7.*|8.*|9.*|1?.*)
                  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: yes, with OpenMP as version ${gxx_version}" >&5
 printf "%s\n" "yes, with OpenMP as version ${gxx_version}" >&6; }
                  ## we know this one is good, yay

configure.ac

@@ -92,7 +92,7 @@ if test x"${openmp_already_works}" = x"no"; then
                  ## we know this one is bad
                  can_use_openmp="no"
             ;;
-            5.4*|5.5*|5.6*|5.7*|5.8*|5.9*|6.*|7.*|8.*|9.*|10.*|11.*|12.*)
+            5.4*|5.5*|5.6*|5.7*|5.8*|5.9*|6.*|7.*|8.*|9.*|1?.*)
                  AC_MSG_RESULT([yes, with OpenMP as version ${gxx_version}])
                  ## we know this one is good, yay
                  can_use_openmp="yes"

src/Makevars.in

@@ -3,18 +3,3 @@
 PKG_CPPFLAGS = -I../inst/include
 PKG_CXXFLAGS = @OPENMP_FLAG@
 PKG_LIBS= @OPENMP_FLAG@ $(LAPACK_LIBS) $(BLAS_LIBS) $(FLIBS)
-
-## With R 3.1.0 or later, you can uncomment the following line to tell R to
-## enable compilation with C++11 (where available)
-##
-## Also, OpenMP support in Armadillo prefers C++11 support. However, for wider
-## availability of the package we do not yet enforce this here.  It is however
-## recommended for client packages to set it.
-##
-## And with R 3.4.0, and RcppArmadillo 0.7.960.*, we turn C++11 on as OpenMP
-## support within Armadillo prefers / requires it
-##
-## R 4.0.0 made C++11 the default, R 4.1.0 switched to C++14, R 4.3.0 to C++17
-## _In general_ we should no longer need to set a standard as any recent R
-## installation will do the right thing. Should you need it, uncomment it and
-## set the appropriate value, possibly CXX17.

src/Makevars.win

@@ -2,18 +2,3 @@
 
 PKG_CXXFLAGS = -I../inst/include -I. $(SHLIB_OPENMP_CXXFLAGS)
 PKG_LIBS = $(SHLIB_OPENMP_CXXFLAGS) $(LAPACK_LIBS) $(BLAS_LIBS) $(FLIBS)
-
-## With R 3.1.0 or later, you can uncomment the following line to tell R to
-## enable compilation with C++11 (where available)
-##
-## Also, OpenMP support in Armadillo prefers C++11 support. However, for wider
-## availability of the package we do not yet enforce this here.  It is however
-## recommended for client packages to set it.
-##
-## And with R 3.4.0, and RcppArmadillo 0.7.960.*, we turn C++11 on as OpenMP
-## support within Armadillo prefers / requires it
-##
-## R 4.0.0 made C++11 the default, R 4.1.0 switched to C++14, R 4.3.0 to C++17
-## _In general_ we should no longer need to set a standard as any recent R
-## installation will do the right thing. Should you need it, uncomment it and
-## set the appropriate value, possibly CXX17.