zephyr: base32: Fix unit tests
This change fixes unit test breakage caused by zephyr already
declaring tolower.
BRANCH=none
TEST=zmake testall
@@ -104,6 +104,7 @@ int isspace(int c);
int isalpha(int c);
int isupper(int c);
int isprint(int c);
+int tolower(int c);
#endif
int memcmp(const void *s1, const void *s2, size_t len);
@@ -154,8 +155,6 @@ char *strzcpy(char *dest, const char *src, int len);
* Other strings return 0 and leave *dest unchanged.
*/
int parse_bool(const char *s, int *dest);
-
-int tolower(int c);
#endif /* !HIDE_EC_STDLIB */
/**
