userenv: Add a small test for DestroyEnvironmentBlock.

dlls/userenv/tests/userenv.c

@@ -197,6 +197,12 @@ static void test_create_env(void)
     r = get_env(env[3], "WINE_XYZZY", &st);
     expect(TRUE, r);
     if (r) HeapFree(GetProcessHeap(), 0, st);
+
+    for (i = 0; i < sizeof(env) / sizeof(env[0]); i++)
+    {
+        r = DestroyEnvironmentBlock(env[i]);
+        expect(TRUE, r);
+    }
 }
 
 START_TEST(userenv)

include/userenv.h

@@ -31,6 +31,7 @@ extern "C" {
 #endif
 
 BOOL WINAPI CreateEnvironmentBlock(LPVOID*,HANDLE,BOOL);
+BOOL WINAPI DestroyEnvironmentBlock(LPVOID);
 BOOL WINAPI ExpandEnvironmentStringsForUserA(HANDLE,LPCSTR,LPSTR,DWORD);
 BOOL WINAPI ExpandEnvironmentStringsForUserW(HANDLE,LPCWSTR,LPWSTR,DWORD);
 #define     ExpandEnvironmentStringsForUser WINELIB_NAME_AW(ExpandEnvironmentStringsForUser)