Create bacnet strnlen and stricmp to avoid libc compiler problems

src/bacnet/basic/sys/platform.h

@@ -77,17 +77,6 @@ __inline int c99_snprintf(char *outBuf, size_t size, const char *format, ...)
     return count;
 }
 #endif
-#elif defined(__ZEPHYR__)
-#include <strings.h>
-/* For some reason my Zephyr build for non-native targets does not
- *  see a definition for strnlen(), but it is visible in when
- *  compiling for native_posix. This results in the compiler
- *  emitting a warning, forcing Zephyr's sanitycheck() script to stop.
- *  Until this is chased down, the definition is being provided here.
- */
-#if !CONFIG_NATIVE_APPLICATION
-size_t strnlen(const char *, size_t);
-#endif
 #endif
 
 /* some common min/max as defined in windef.h */