Add missing include for getpagesize, and fix a typo.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@74588 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/enable_execute_stack.c b/lib/enable_execute_stack.c
index 534ce2f..15ab03f 100644
--- a/lib/enable_execute_stack.c
+++ b/lib/enable_execute_stack.c
@@ -9,6 +9,9 @@
 
 #include <stdint.h>
 #include <sys/mman.h>
+#ifndef __APPLE__
+#include <unistd.h>
+#endif
 
 
 //
@@ -25,7 +28,7 @@
 	const uintptr_t pageSize = 4096;
 #else
         // FIXME: We should have a configure check for this.
-        const uintptr_t pagesize = getpagesize();
+        const uintptr_t pageSize = getpagesize();
 #endif
 	const uintptr_t pageAlignMask = ~(pageSize-1);
 	uintptr_t p = (uintptr_t)addr;