[Fix] remove nvm_supports_source_options

Fixes #2387

nvm.sh

@@ -3931,7 +3931,7 @@ nvm() {
         nvm_has_system_node nvm_has_system_iojs \
         nvm_download nvm_get_latest nvm_has nvm_install_default_packages nvm_get_default_packages \
         nvm_curl_use_compression nvm_curl_version \
-        nvm_supports_source_options nvm_auto nvm_supports_xz \
+        nvm_auto nvm_supports_xz \
         nvm_echo nvm_err nvm_grep nvm_cd \
         nvm_die_on_prefix nvm_get_make_jobs nvm_get_minor_version \
         nvm_has_solaris_binary nvm_is_merged_node_version \
@@ -4013,14 +4013,6 @@ nvm_install_default_packages() {
   fi
 }
 
-nvm_supports_source_options() {
-  # shellcheck disable=SC1091,SC2240
-    [ "_$( . /dev/stdin yes 2> /dev/null <<'EOF'
-[ $# -gt 0 ] && nvm_echo $1
-EOF
-  )" = "_yes" ]
-}
-
 nvm_supports_xz() {
   if [ -z "${1-}" ]; then
     return 1
@@ -4108,15 +4100,13 @@ nvm_auto() {
 nvm_process_parameters() {
   local NVM_AUTO_MODE
   NVM_AUTO_MODE='use'
-  if nvm_supports_source_options; then
-    while [ $# -ne 0 ]; do
-      case "$1" in
-        --install) NVM_AUTO_MODE='install' ;;
-        --no-use) NVM_AUTO_MODE='none' ;;
-      esac
-      shift
-    done
-  fi
+  while [ $# -ne 0 ]; do
+    case "$1" in
+      --install) NVM_AUTO_MODE='install' ;;
+      --no-use) NVM_AUTO_MODE='none' ;;
+    esac
+    shift
+  done
   nvm_auto "${NVM_AUTO_MODE}"
 }