cc3200: Move stoupper to ftp.c and define in terms of unichar_toupper.

ftp.c is the only user of this function so making it static in that file
allows it to be inlined.  Also, reusing unichar_toupper means we no longer
depend on the C stdlib for toupper, saving about 300 bytes of code space.

cc3200/ftp/ftp.c

@@ -932,6 +932,13 @@ static void ftp_close_cmd_data (void) {
     ftp_close_filesystem_on_error ();
 }
 
+static void stoupper (char *str) {
+    while (str && *str != '\0') {
+        *str = (char)unichar_toupper((int)(*str));
+        str++;
+    }
+}
+
 static ftp_cmd_index_t ftp_pop_command (char **str) {
     char _cmd[FTP_CMD_SIZE_MAX];
     ftp_pop_param (str, _cmd);

cc3200/main.c

@@ -98,13 +98,6 @@ int main (void) {
     for ( ; ; );
 }
 
-void stoupper (char *str) {
-    while (str && *str != '\0') {
-        *str = (char)toupper((int)(*str));
-        str++;
-    }
-}
-
 // We need this when configSUPPORT_STATIC_ALLOCATION is enabled
 void vApplicationGetIdleTaskMemory( StaticTask_t **ppxIdleTaskTCBBuffer,
                                     StackType_t **ppxIdleTaskStackBuffer,

cc3200/util/std.h

@@ -31,6 +31,3 @@ typedef unsigned int size_t;
 
 int printf(const char *fmt, ...);
 int snprintf(char *str, size_t size, const char *fmt, ...);
-
-// Convenience function, defined in main.c.
-void stoupper (char *str);