feat: Intel HDA audio driver, audio streaming syscalls, userspace Music app, fixes and improvements, rudimentary Bluetooth support

programs/include/libc/string.h

@@ -13,6 +13,7 @@ void *memcpy(void *dest, const void *src, size_t n);
 void *memset(void *s, int c, size_t n);
 void *memmove(void *dest, const void *src, size_t n);
 int   memcmp(const void *s1, const void *s2, size_t n);
+void *memchr(const void *s, int c, size_t n);
 
 size_t strlen(const char *s);
 int    strcmp(const char *s1, const char *s2);