Auto merge of #2374 - devnexen:linux_malloc_info, r=Amanieu

linux glibc and android adding malloc_info fn.

Author: bors

libc-test/semver/linux-gnu.txt

@@ -548,6 +548,7 @@ globfree
 globfree64
 mallinfo
 mallinfo2
+malloc_info
 malloc_usable_size
 mallopt
 nl_mmap_hdr

src/unix/linux_like/android/mod.rs

@@ -2570,6 +2570,9 @@ extern "C" {
     pub fn __sched_cpucount(setsize: ::size_t, set: *const cpu_set_t) -> ::c_int;
     pub fn sched_getcpu() -> ::c_int;
     pub fn mallinfo() -> ::mallinfo;
+    // available from API 23
+    pub fn malloc_info(options: ::c_int, stream: *mut ::FILE) -> ::c_int;
+
     pub fn malloc_usable_size(ptr: *const ::c_void) -> ::size_t;
 
     pub fn utmpname(name: *const ::c_char) -> ::c_int;

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

@@ -1326,6 +1326,7 @@ extern "C" {
     pub fn sched_getcpu() -> ::c_int;
     pub fn mallinfo() -> ::mallinfo;
     pub fn mallinfo2() -> ::mallinfo2;
+    pub fn malloc_info(options: ::c_int, stream: *mut ::FILE) -> ::c_int;
     pub fn malloc_usable_size(ptr: *mut ::c_void) -> ::size_t;
     pub fn getpwent_r(
         pwd: *mut ::passwd,