modulebuild.conf.in: OS specific config removed

config/modbuild.conf.in

 #!/bin/bash
-
-#
-# define PMODULES_ROOT only if it has not been passed as argument
-# to build/install scripts
 #
 : ${PMODULES_ROOT:=@PMODULES_ROOT@}
 : ${PMODULES_DISTFILESDIR:=@PMODULES_DISTFILESDIR@}
 : ${PMODULES_TMPDIR:=@PMODULES_TMPDIR@}
+export     PMODULES_ROOT
+export     PMODULES_DISTFILESDIR
+export     PMODULES_TMPDIR
 
 declare -x PMODULES_CONFIG_DIR='config'
 declare -x PMODULES_MODULEFILES_DIR='modulefiles'
@@ -17,16 +16,3 @@ declare -x PMODULES_DEFAULT_GROUPS='Tools Programming'
 declare -x PMODULES_DEFINED_RELEASES=':unstable:stable:deprecated:'
 declare -x PMODULES_DEFAULT_RELEASES='stable'
 
-export     PMODULES_DISTFILESDIR
-export     PMODULES_TMPDIR
-
-#-----------------------------------------------------------------------------
-# OS specific configuration
-#
-case ${OS} in
-Darwin )
-	declare -x MACOSX_DEPLOYMENT_TARGET='10.12'
-	#declare -rx SDKROOT='macosx10.9'
-	;;
-esac
-