Don't copy the environment to update it

This causes problems on windows, and is wasteful anyway. The subprocess
will pick up the environment from its parent.

support/test/cpp/simple_c_program/.vimspector.json

@@ -1,12 +1,20 @@
 {
   "configurations": {
-    "simple_c_program - Launch": {
+    "CodeLLDB": {
       "adapter": "CodeLLDB",
       "configuration": {
         "request": "launch",
         "program": "${workspaceRoot}/test",
         "stopAtEntry": true
       }
+    },
+    "lldb-vscode": {
+      "adapter": "lldb-vscode",
+      "configuration": {
+        "request": "launch",
+        "program": "${workspaceRoot}/test",
+        "stopAtEntry": true
+      }
     }
   }
 }

support/test/cpp/simple_c_program/test_c.cpp

@@ -1,3 +1,5 @@
+#include <cstdio>
+#include <cstdlib>
 #include <iostream>
 
 namespace Test
@@ -33,6 +35,8 @@ int main ( int argc, char ** argv )
 {
   int x{ 10 };
 
+  printf( "HOME: %s\n", getenv( "HOME" ) );
+
   Test::TestStruct t{ true, {99} };
   foo( t );
 }