Changes to get PX4 config to build. Also some warning removal

libc/stdio/lib_fread.c

@@ -97,5 +97,3 @@ size_t fread(FAR void *ptr, size_t size, size_t n_items, FAR FILE *stream)
     }
   return items_read;
 }
-
-

libc/stdio/lib_libfgets.c

@@ -47,6 +47,8 @@
 #include <assert.h>
 #include <debug.h>
 
+#include "lib_internal.h"
+
 /****************************************************************************
  * Pre-processor Definitions
  ****************************************************************************/
@@ -142,7 +144,7 @@ static void consume_eol(FILE *stream, bool consume)
 FAR char *lib_fgets(FAR char *buf, size_t buflen, FILE *stream,
                     bool keepnl, bool consume)
 {
-  int nch = 0;
+  size_t nch = 0;
 
   /* Sanity checks */
 

libc/stdio/lib_libfread.c

@@ -204,7 +204,7 @@ ssize_t lib_fread(FAR void *ptr, size_t count, FAR FILE *stream)
 
                       /* Were all of the requested bytes read? */
 
-                      if (bytes_read < count)
+                      if ((size_t)bytes_read < count)
                         {
                           /* No.  We must be at the end of file. */
 

libc/stdio/lib_sscanf.c

@@ -44,6 +44,7 @@
 #include <stdarg.h>
 #include <stdlib.h>
 #include <stdbool.h>
+#include <stdio.h>
 #include <string.h>
 #include <ctype.h>
 #include <errno.h>

libc/stdio/lib_stdoutstream.c

@@ -83,7 +83,7 @@ static void stdoutstream_putc(FAR struct lib_outstream_s *this, int ch)
  ****************************************************************************/
 
 #if defined(CONFIG_STDIO_LINEBUFFER) && CONFIG_STDIO_BUFFER_SIZE > 0
-int stdoutstream_flush(FAR struct lib_outstream_s *this)
+static int stdoutstream_flush(FAR struct lib_outstream_s *this)
 {
   FAR struct lib_stdoutstream_s *sthis = (FAR struct lib_stdoutstream_s *)this;
   return lib_fflush(sthis->stream, true);