IC:2021-09-07, Bump to v5.1.0-rc1+dev604

Part of nasa/cFS#351

Author: astrogeco

README.md

@@ -11,6 +11,11 @@ The autogenerated OSAL user's guide can be viewed at <https://github.com/nasa/cF
 
 ## Version History
 
+### Development Build: v5.1.0-rc1+dev604
+
+- Add typecast to memchr call
+- Regex update in coverage enforcement to match `.0`
+- See <https://github.com/nasa/osal/pull/1145> and <https://github.com/nasa/cFS/pull/351>
 ### Development Build: v5.1.0-rc1+dev598
 
 - Add UTAssert macros that help test bit field storage

src/os/inc/osapi-version.h

@@ -36,7 +36,7 @@
 /*
  * Development Build Macro Definitions
  */
-#define OS_BUILD_NUMBER   598
+#define OS_BUILD_NUMBER   604
 #define OS_BUILD_BASELINE "v5.1.0-rc1"
 
 /*