Get things to build on RTEMS.

src/libCom/osi/os/RTEMS/osiUnistd.h

@@ -39,6 +39,11 @@ extern "C" {
 int putenv (char *);
 char *strdup (const char *);
 
+int snprintf(char *str, size_t size, const char *format, ...);
+#include <stdarg.h>
+int vsnprintf(char *str, size_t size, const char *format, va_list ap);
+
+
 #ifdef __cplusplus
 }
 #endif

src/libCom/osi/os/posix/epicsStdio.cpp

@@ -9,6 +9,7 @@
 \*************************************************************************/
 
 #include <epicsStdio.h>
+#include <osiUnistd.h>
 
 extern "C" {