fakeroot: Alpine linux libc.musl build error fix

Prevent build error on Alpine Linux host:
libfakeroot.c error: conflicting types for 'id_t'
Error relocating openwrt/staging_dir/host/lib/libfakeroot.so: SEND_GET_XATTR: symbol not found

Signed-off-by: Ruslan Isaev <legale.legale@gmail.com>

tools/fakeroot/patches/400-alpine-libc.musl-fix.patch

@@ -0,0 +1,34 @@
+Alpine linux libc.musl build error fix
+
+Prevent build error on Alpine Linux host:
+libfakeroot.c error: conflicting types for 'id_t'
+Error relocating openwrt/staging_dir/host/lib/libfakeroot.so: SEND_GET_XATTR: symbol not found
+
+--- a/libfakeroot.c
++++ b/libfakeroot.c
+@@ -81,12 +81,14 @@
+ #define SEND_STAT64(a,b,c) send_stat64(a,b,c)
+ #define SEND_GET_STAT(a,b) send_get_stat(a,b)
+ #define SEND_GET_STAT64(a,b) send_get_stat64(a,b)
++#define SEND_GET_XATTR(a,b,c) send_get_xattr(a,b,c)
+ #define SEND_GET_XATTR64(a,b,c) send_get_xattr64(a,b,c)
+ #else
+ #define SEND_STAT(a,b,c) send_stat(a,b)
+ #define SEND_STAT64(a,b,c) send_stat64(a,b)
+ #define SEND_GET_STAT(a,b) send_get_stat(a)
+ #define SEND_GET_STAT64(a,b) send_get_stat64(a)
++#define SEND_GET_XATTR(a,b,c) send_get_xattr(a,b)
+ #define SEND_GET_XATTR64(a,b,c) send_get_xattr64(a,b)
+ #endif
+ 
+@@ -125,8 +127,9 @@
+ 
+ /* 10.10 uses id_t in getpriority/setpriority calls, so pretend
+    id_t is used everywhere, just happens to be int on some OSes */
+-#ifndef _ID_T
++#if !defined(_ID_T) && !defined(__DEFINED_id_t)
+ #define _ID_T
++#define __DEFINED_id_t
+ typedef int id_t;
+ #endif
+ #endif