libpayload: Improve compatibility

Define INT_MAX, EOF and make sure size_t is available.

Change-Id: I1b4b717d2545ea8312ec52339300307a5bd68f8a
Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Reviewed-on: http://review.coreboot.org/104
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

payloads/libpayload/include/limits.h

@@ -41,5 +41,6 @@
 #endif
 
 #define UINT_MAX (unsigned int)0xffffffff
+#define INT_MAX (unsigned int)0x7fffffff
 
 #endif

payloads/libpayload/include/stdarg.h

@@ -30,6 +30,7 @@
 #ifndef _LIBPAYLOAD_STDARG_H
 #define _LIBPAYLOAD_STDARG_H
 
+#include <stddef.h>
 #include_next <stdarg.h>
 
 /**

payloads/libpayload/include/stdio.h

@@ -32,6 +32,8 @@
 
 #include <stddef.h>
 
+#define EOF (-1)
+
 typedef struct _FILE FILE;
 
 extern FILE *stdout, *stdin, *stderr;