Linux build fixes

examples/tasks_pthreads.cpp

@@ -54,6 +54,9 @@
 #include <stdint.h>
 #include <stdlib.h>
 #include <errno.h>
+#ifdef ISPC_IS_LINUX
+#include <malloc.h>
+#endif
 
 static int initialized = 0;
 static volatile int32_t lock = 0;

ispc_test.cpp

@@ -49,6 +49,9 @@
 #include <stdint.h>
 #include <stdlib.h>
 #include <memory.h>
+#ifdef ISPC_IS_LINUX
+#include <malloc.h>
+#endif
 
 #ifdef ISPC_HAVE_SVML
 #include <xmmintrin.h>

test_static.cpp

@@ -43,6 +43,9 @@
 #include <stdio.h>
 #include <assert.h>
 #include <stdint.h>
+#ifdef ISPC_IS_LINUX
+#include <malloc.h>
+#endif
 
 extern "C" {
     extern int width();