remove unused TEMP_WINDOWS more thoroughly (see also fa18208fd7bd and 37f852399a32);

--- a/Admin/Windows/Cygwin/Cygwin-Terminal.bat	Wed Mar 27 15:01:38 2024 +0100
+++ b/Admin/Windows/Cygwin/Cygwin-Terminal.bat	Wed Mar 27 15:38:41 2024 +0100
@@ -1,6 +1,5 @@
 @echo off
 
-set TEMP_WINDOWS=%TEMP%
 set HOME=%HOMEDRIVE%%HOMEPATH%
 set PATH=%CD%\bin;%PATH%
 set LANG=en_US.UTF-8

--- a/Admin/components/components.sha1	Wed Mar 27 15:01:38 2024 +0100
+++ b/Admin/components/components.sha1	Wed Mar 27 15:38:41 2024 +0100
@@ -176,6 +176,7 @@
 cb9f061ccd7c6f90d00c8aa115aeea8679f3f996 isabelle_setup-20221028.tar.gz
 f582c621471583d06e00007c6acc01376c7395af isabelle_setup-20230206.tar.gz
 d30109fe63cec35c31cee9ffd17ae3a13c1e6a33 isabelle_setup-20230922.tar.gz
+cd92c141883f0f6a18adceb885316c8b6119e648 isabelle_setup-20240327.tar.gz
 f23037b322b968c61350f9ec9995a4f397e6c71c javamail-1.4.7.tar.gz
 18e6b60ceb98e327fbf14e52f4613dd5b0483d2f javamail-20240109.tar.gz
 0b2206f914336dec4923dd0479d8cee4b904f544 jdk-11+28.tar.gz

--- a/Admin/components/main	Wed Mar 27 15:01:38 2024 +0100
+++ b/Admin/components/main	Wed Mar 27 15:38:41 2024 +0100
@@ -11,7 +11,7 @@
 foiltex-2.1.4b
 idea-icons-20210508
 isabelle_fonts-20211004
-isabelle_setup-20230922
+isabelle_setup-20240327
 javamail-20240109
 jdk-21.0.2
 jedit-20231120

--- a/src/Pure/ROOT.scala	Wed Mar 27 15:01:38 2024 +0100
+++ b/src/Pure/ROOT.scala	Wed Mar 27 15:38:41 2024 +0100
@@ -29,4 +29,3 @@
   def if_proper[A](x: Iterable[A], body: => String): String = Library.if_proper(x, body)
   def if_proper(b: Boolean, body: => String): String = Library.if_proper(b, body)
 }
-

--- a/src/Tools/Setup/src/Environment.java	Wed Mar 27 15:01:38 2024 +0100
+++ b/src/Tools/Setup/src/Environment.java	Wed Mar 27 15:38:41 2024 +0100
@@ -366,11 +366,7 @@
             BiFunction<String,String,Void> env_default =
                 (String a, String b) -> { if (!b.isEmpty()) env.putIfAbsent(a, b); return null; };
 
-            String temp_windows = is_windows() ? System.getenv("TEMP") : null;
-
             env_default.apply("CYGWIN_ROOT", cygwin_root);
-            env_default.apply("TEMP_WINDOWS",
-                (temp_windows != null && temp_windows.contains("\\")) ? temp_windows : "");
             env_default.apply("ISABELLE_JDK_HOME",
                 standard_path(cygwin_root, System.getProperty("java.home", "")));
             env_default.apply("HOME", System.getProperty("user.home", ""));