fix compilation on musl

this should allow for compilation on musl libc

possibly fixes #150

Author: classabbyamp

src/decode_aprs.c

@@ -3930,11 +3930,7 @@ static void decode_tocall (decode_aprs_t *A, char *dest)
  * models before getting to the more generic APY.
  */
 
-#if defined(__WIN32__) || defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__APPLE__)
 	    qsort (tocalls, num_tocalls, sizeof(struct tocalls_s), tocall_cmp);
-#else
-	    qsort (tocalls, num_tocalls, sizeof(struct tocalls_s), (__compar_fn_t)tocall_cmp);
-#endif
 	  }
 	  else {
 	    if ( ! A->g_quiet) {

src/direwolf.h

@@ -282,7 +282,7 @@ char *strtok_r(char *str, const char *delim, char **saveptr);
 char *strcasestr(const char *S, const char *FIND);
 
 
-#if defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__APPLE__)
+#if ! defined(__GLIBC__) || defined(__OpenBSD__) || defined(__FreeBSD__) || defined(__APPLE__)
 
 // strlcpy and strlcat should be in string.h and the C library.