Add rs_allocation_create as an RS header

https://android-review.googlesource.com/#/c/175582/ adds a new header
rs_allocation_create.rsh.  This CL adds it to the list of headers
recognized by slang.

Change-Id: I5dc8f540ef2d09f06f0bbcaacc0ef84c2388e33d
diff --git a/slang.cpp b/slang.cpp
index ed626d6..18c5f24 100644
--- a/slang.cpp
+++ b/slang.cpp
@@ -99,6 +99,7 @@
 
 /* RS_HEADER_ENTRY(name) */
 #define ENUM_RS_HEADER()  \
+  RS_HEADER_ENTRY(rs_allocation_create) \
   RS_HEADER_ENTRY(rs_allocation_data) \
   RS_HEADER_ENTRY(rs_atomic) \
   RS_HEADER_ENTRY(rs_convert) \