fix Linux build due to missing include

[danielmaciel]

No description provided.

[mmozeiko]

This include should be <emmintrin.h> and it should be under #if ARCH_X64 not compiler. Here's a better diff with this fix:

diff --git a/src/base/base_core.h b/src/base/base_core.h
index 6df8361b..33eb6f9c 100644
--- a/src/base/base_core.h
+++ b/src/base/base_core.h
@@ -300,6 +300,10 @@
 # error Atomic intrinsics for pointers not defined for this architecture.
 #endif

+#if ARCH_X64
+# include <emmintrin.h>
+#endif
+
 ////////////////////////////////
 //~ rjf: Linked List Building Macros