fix linux compile by including linux/prctl.h

Author: daanx

src/prim/unix/prim.c

@@ -31,11 +31,12 @@ terms of the MIT license. A copy of the license can be found in the file
 
 #if defined(__linux__)
   #include <features.h>
+  #include <linux/prctl.h>  // PR_SET_VMA
   //#if defined(MI_NO_THP)
-  #include <sys/prctl.h>  // THP disable
+  #include <sys/prctl.h>    // THP disable
   //#endif
   #if defined(__GLIBC__)
-  #include <linux/mman.h> // linux mmap flags
+  #include <linux/mman.h>   // linux mmap flags
   #else
   #include <sys/mman.h>
   #endif
@@ -207,7 +208,7 @@ static int unix_madvise(void* addr, size_t size, int advice) {
 
 static void* unix_mmap_prim(void* addr, size_t size, int protect_flags, int flags, int fd) {
   void* p = mmap(addr, size, protect_flags, flags, fd, 0 /* offset */);
-  #if (defined(__linux__) || defined(__ANDROID__))     
+  #if (defined(__linux__) && defined(PR_SET_VMA))
   if (p!=MAP_FAILED && p!=NULL) {
     prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, p, size, "mimalloc");
   }