padsp: Make it compile on musl

break assumptions on glibc and there is no stat64 on non
glibc C libraries

See pulseaudio bug

https://bugs.freedesktop.org/show_bug.cgi?id=85319

Signed-off-by: Khem Raj <raj.khem@gmail.com>

src/utils/padsp.c

@@ -2394,7 +2394,7 @@ static int dsp_ioctl(fd_info *i, unsigned long request, void*argp, int *_errno)
     return ret;
 }
 
-#ifdef sun
+#ifndef __GLIBC__
 int ioctl(int fd, int request, ...) {
 #else
 int ioctl(int fd, unsigned long request, ...) {
@@ -2534,10 +2534,13 @@ int stat(const char *pathname, struct stat *buf) {
 
     return 0;
 }
-
 #ifdef HAVE_OPEN64
-
+#undef stat64
+#ifdef __GLIBC__
 int stat64(const char *pathname, struct stat64 *buf) {
+#else
+int stat64(const char *pathname, struct stat *buf) {
+#endif
     struct stat oldbuf;
     int ret;
 
@@ -2570,7 +2573,7 @@ int stat64(const char *pathname, struct stat64 *buf) {
 
     return 0;
 }
-
+#undef open64
 int open64(const char *filename, int flags, ...) {
     va_list args;
     mode_t mode = 0;
@@ -2696,8 +2699,8 @@ FILE* fopen(const char *filename, const char *mode) {
 }
 
 #ifdef HAVE_OPEN64
-
-FILE *fopen64(const char *filename, const char *mode) {
+#undef fopen64
+FILE *fopen64(const char *__restrict filename, const char *__restrict mode) {
 
     debug(DEBUG_LEVEL_VERBOSE, __FILE__": fopen64(%s)\n", filename?filename:"NULL");