Respect CXX configuration variable, fixes https://trac.macports.org/ticket/68723,
submitted upstreams: https://github.com/pgpointcloud/pointcloud/pull/350

--- config.mk.in.orig
+++ config.mk.in
@@ -1,6 +1,7 @@
 CC = @CC@
-CFLAGS = @CFLAGS@
-CXXFLAGS += -fPIC -std=c++0x
+CXX = @CXX@
+CFLAGS += @CFLAGS@
+CXXFLAGS += -fPIC -std=c++11 @CXXFLAGS@
 SQLPP = @SQLPP@
 
 XML2_CPPFLAGS = @XML2_CPPFLAGS@



--- configure.ac.orig
+++ configure.ac
@@ -377,6 +377,7 @@
 AC_MSG_RESULT()
 AC_MSG_RESULT([ -------------- Compiler Info ------------- ])
 AC_MSG_RESULT([  C compiler:           ${CC} ${CFLAGS}])
+AC_MSG_RESULT([  CXX compiler:         ${CXX} ${CXXFLAGS}])
 AC_MSG_RESULT([  SQL preprocessor:     ${SQLPP}])
 AC_MSG_RESULT()
 AC_MSG_RESULT([ -------------- Dependencies -------------- ])