remove emsdk cache

emsdk-cache/emsdk-main/emsdk_env.csh

@@ -1,30 +0,0 @@
-# This script is sourced by the user and uses
-# their shell. Try not to use tcshisms.
-
-# Do not execute this script without sourcing,
-# because it won't have any effect then.
-# That is, always run this script with
-#
-#     source ./emsdk_env.csh
-#
-# instead of just plainly running with
-#
-#     ./emsdk_env.csh
-#
-# which won't have any effect.
-set SRC=($_)
-if ("$SRC" == "") then
-  set SRC="$0"
-else
-  set SRC="$SRC[1]"
-endif
-set CURDIR=`pwd`
-setenv DIR `dirname "$SRC"`
-unset SRC
-
-setenv EMSDK_CSH 1
-
-eval `$DIR/emsdk construct_env`
-unsetenv DIR
-
-unsetenv EMSDK_CSH