Add compatibility for seldom-used avr-libc _PF functions

teensy3/avr/pgmspace.h

 #define vsprintf_P(s, ...) vsprintf((s), __VA_ARGS__)
 #define vsnprintf_P(s, n, ...) vsnprintf((s), (n), __VA_ARGS__)
 #define fprintf_P(fp, ...) fprintf((fp), __VA_ARGS__)
+#define strlen_PF(a) strlen((a))
+#define strnlen_PF(src, len) strnlen((src), (len))
+#define memcpy_PF(dest, src, len) memcpy((dest), (src), (len))
+#define strcpy_PF(dest, src) strcpy((dest), (src))
+#define strncpy_PF(dest, src, len) strncpy((dest), (src), (len))
+#define strcat_PF(dest, src) strcat((dest), (src))
+#define strlcat_PF(dest, src, len) strlcat((dest), (src), (len))
+#define strncat_PF(dest, src, len) strncat((dest), (src), (len))
+#define strcmp_PF(s1, s2) strcmp((s1), (s2))
+#define strncmp_PF(s1, s2, n) strncmp((s1), (s2), (n))
+#define strcasecmp_PF(s1, s2) strcasecmp((s1), (s2))
+#define strncasecmp_PF(s1, s2, n) strncasecmp((s1), (s2), (n))
+#define strstr_PF(s1, s2) strstr((s1), (s2))
+#define strlcpy_PF(dest, src, n) strlcpy((dest), (src), (n))
+#define memcmp_PF(s1, s2, n) memcmp((s1), (s2), (n))
+
 
 #define pgm_read_byte(addr) (*(const unsigned char *)(addr))
 #if 0