gnu: Add f_flags to struct statfs for arm, mips, powerpc and x86

(backport <rust-lang#3663>)
(cherry picked from commit 12e3a0b)

Author: snogge

src/unix/linux_like/linux/gnu/b32/arm/mod.rs

@@ -22,7 +22,8 @@ s! {
 
         pub f_namelen: ::__fsword_t,
         pub f_frsize: ::__fsword_t,
-        f_spare: [::__fsword_t; 5],
+        pub f_flags: ::__fsword_t,
+        f_spare: [::__fsword_t; 4],
     }
 
     pub struct flock {

src/unix/linux_like/linux/gnu/b32/mips/mod.rs

@@ -37,7 +37,8 @@ s! {
         pub f_fsid: ::fsid_t,
 
         pub f_namelen: ::c_long,
-        f_spare: [::c_long; 6],
+        pub f_flags: ::c_long,
+        f_spare: [::c_long; 5],
     }
 
     pub struct statfs64 {

src/unix/linux_like/linux/gnu/b32/powerpc.rs

@@ -22,7 +22,8 @@ s! {
 
         pub f_namelen: ::__fsword_t,
         pub f_frsize: ::__fsword_t,
-        f_spare: [::__fsword_t; 5],
+        pub f_flags: ::__fsword_t,
+        f_spare: [::__fsword_t; 4],
     }
 
     pub struct flock {

src/unix/linux_like/linux/gnu/b32/x86/mod.rs

@@ -23,7 +23,8 @@ s! {
 
         pub f_namelen: ::__fsword_t,
         pub f_frsize: ::__fsword_t,
-        f_spare: [::__fsword_t; 5],
+        pub f_flags: ::__fsword_t,
+        f_spare: [::__fsword_t; 4],
     }
 
     pub struct flock {