Implemented CreateToolhelp32Snapshot, including two of the routines
using snapshots, Process32First and Process32Next.

include/tlhelp32.h

diff --git a/include/tlhelp32.h b/include/tlhelp32.h
new file mode 100644
index 0000000..b8b798a
--- /dev/null
+++ b/include/tlhelp32.h
@@ -0,0 +1,29 @@
+#ifndef __WINE_TLHELP32_H
+#define __WINE_TLHELP32_H
+
+#include "windows.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+  /*===================================================================
+   *  Arguments for Toolhelp routines
+   */
+
+  /*
+   * CreateToolhelp32Snapshot
+   */
+
+#define TH32CS_SNAPHEAPLIST 0x00000001
+#define TH32CS_SNAPPROCESS  0x00000002
+#define TH32CS_SNAPTHREAD   0x00000004
+#define TH32CS_SNAPMODULE   0x00000008
+#define TH32CS_SNAPALL     (TH32CS_SNAPHEAPLIST | TH32CS_SNAPPROCESS | TH32CS_SNAPTHREAD | TH32CS_SNAPMODULE)
+#define TH32CS_INHERIT     0x80000000
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#endif /* __WINE_TLHELP32_H */