Fix #8, support disable ASM to avoid building bug.

Author: winlinvip

README.md

@@ -20,6 +20,7 @@ The branch [srs](https://github.com/ossrs/state-threads/tree/srs) will be patche
 - [x] Merge from [michaeltalyansky](https://github.com/michaeltalyansky/state-threads) and [xzh3836598](https://github.com/ossrs/state-threads/commit/9a17dec8f9c2814d93761665df7c5575a4d2d8a3), support [ARM](https://github.com/ossrs/state-threads/issues/1).
 - [x] Merge from [toffaletti](https://github.com/toffaletti/state-threads), support [valgrind](https://github.com/ossrs/state-threads/issues/2) for ST.
 - [x] Patch [st.osx10.14.build.patch](https://github.com/ossrs/srs/blob/2.0release/trunk/3rdparty/patches/6.st.osx10.14.build.patch), for osx 10.14 build.
+- [x] Support macro `MD_ST_NO_ASM` to disable ASM, [#8](https://github.com/ossrs/state-threads/issues/8).
 
 ## Docs
 

md.S

@@ -1,4 +1,6 @@
-#if defined(MD_USE_BUILTIN_SETJMP)
+
+/* If user disable the ASM, such as avoiding bugs in ASM, donot compile it. */
+#if !defined(MD_ST_NO_ASM)
 
 /*
  * Portions created by SGI are Copyright (C) 2000 Silicon Graphics, Inc.