Auto merge of #2698 - devnexen:linux_glibc_getentropy, r=Amanieu

linux glibc add getentropy.

Author: bors

libc-test/build.rs

@@ -1759,6 +1759,9 @@ fn test_android(target: &str) {
             // Added in API level 30, but tests use level 28.
             "mlock2" => true,
 
+            // Added in glibc 2.25.
+            "getentropy" => true,
+
             _ => false,
         }
     });

libc-test/semver/linux-gnu.txt

@@ -584,6 +584,7 @@ explicit_bzero
 fgetspent_r
 futimes
 getauxval
+getentropy
 getgrent_r
 getloadavg
 getpt

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

@@ -1185,6 +1185,7 @@ extern "C" {
         mask: ::c_uint,
         statxbuf: *mut statx,
     ) -> ::c_int;
+    pub fn getentropy(buf: *mut ::c_void, buflen: ::size_t) -> ::c_int;
     pub fn getrandom(buf: *mut ::c_void, buflen: ::size_t, flags: ::c_uint) -> ::ssize_t;
     pub fn getauxval(type_: ::c_ulong) -> ::c_ulong;