Add mallopt and related constants for Android

The `HeapTaggingLevel` enum does not have a typedef alias and thus
generated tests will not compile due to the missing `enum` keyword.  As
a result the constants are defined using `i32` to match the signature
for `mallopt`.

See: https://cs.android.com/android/platform/superproject/main/+/main:bionic/libc/include/malloc.h;l=215

Author: chriswailes

libc-test/semver/android.txt

@@ -1326,6 +1326,22 @@ MS_STRICTATIME
 MS_SYNC
 MS_SYNCHRONOUS
 MS_UNBINDABLE
+M_BIONIC_SET_HEAP_TAGGING_LEVEL
+M_BIONIC_ZERO_INIT
+M_CACHE_COUNT_MAX
+M_CACHE_SIZE_MAX
+M_DECAY_TIME
+M_HEAP_TAGGING_LEVEL_ASYNC
+M_HEAP_TAGGING_LEVEL_NONE
+M_HEAP_TAGGING_LEVEL_SYNC
+M_HEAP_TAGGING_LEVEL_TBI
+M_MEMTAG_TUNING
+M_MEMTAG_TUNING_BUFFER_OVERFLOW
+M_MEMTAG_TUNING_UAF
+M_PURGE
+M_PURGE_ALL
+M_THREAD_DISABLE_MEM_INIT
+M_TSDS_COUNT_MAX
 NCCS
 NCP_SUPER_MAGIC
 NDA_CACHEINFO
@@ -3520,6 +3536,7 @@ makedev
 mallinfo
 malloc
 malloc_usable_size
+mallopt
 mcontext_t
 memalign
 memchr

src/unix/linux_like/android/mod.rs

@@ -3153,6 +3153,26 @@ pub const IFLA_INFO_XSTATS: c_ushort = 3;
 pub const IFLA_INFO_SLAVE_KIND: c_ushort = 4;
 pub const IFLA_INFO_SLAVE_DATA: c_ushort = 5;
 
+// malloc.h
+pub const M_DECAY_TIME: c_int = -100;
+pub const M_PURGE: c_int = -101;
+pub const M_MEMTAG_TUNING: c_int = -102;
+pub const M_THREAD_DISABLE_MEM_INIT: c_int = -103;
+pub const M_PURGE_ALL: c_int = -104;
+pub const M_CACHE_COUNT_MAX: c_int = -200;
+pub const M_CACHE_SIZE_MAX: c_int = -201;
+pub const M_TSDS_COUNT_MAX: c_int = -202;
+pub const M_BIONIC_ZERO_INIT: c_int = -203;
+pub const M_BIONIC_SET_HEAP_TAGGING_LEVEL: c_int = -204;
+
+pub const M_MEMTAG_TUNING_BUFFER_OVERFLOW: c_int = 0;
+pub const M_MEMTAG_TUNING_UAF: c_int = 1;
+
+pub const M_HEAP_TAGGING_LEVEL_NONE: i32 = 0;
+pub const M_HEAP_TAGGING_LEVEL_TBI: i32 = 1;
+pub const M_HEAP_TAGGING_LEVEL_ASYNC: i32 = 2;
+pub const M_HEAP_TAGGING_LEVEL_SYNC: i32 = 3;
+
 // linux/rtnetlink.h
 pub const TCA_UNSPEC: c_ushort = 0;
 pub const TCA_KIND: c_ushort = 1;
@@ -3650,6 +3670,9 @@ extern "C" {
 
     pub fn malloc_usable_size(ptr: *const c_void) -> size_t;
 
+    // available from API level 26
+    pub fn mallopt(opt: c_int, arg: c_int) -> c_int;
+
     pub fn utmpname(name: *const c_char) -> c_int;
     pub fn setutent();
     pub fn getutent() -> *mut utmp;