Bug 1115078 - Unbreak MOZ_JEMALLOC3 build on FreeBSD after bug 899126. r=glandium

configure.in

@@ -3416,6 +3416,8 @@ for file in $MALLOC_HEADERS; do
   fi
 done
 
+MOZ_CHECK_HEADERS(alloca.h)
+
 AC_CHECK_FUNCS(strndup posix_memalign memalign)
 
 AC_CHECK_FUNCS(malloc_usable_size)

memory/build/mozjemalloc_compat.c

@@ -10,7 +10,6 @@
 
 #include "mozmemory_wrap.h"
 #include "jemalloc_types.h"
-#include "jemalloc/internal/jemalloc_internal_defs.h" // for JEMALLOC_HAS_ALLOCA_H
 #include "mozilla/Types.h"
 
 #include <stdbool.h>
@@ -69,7 +68,7 @@ je_(nallocx)(size_t size, int flags);
 #    include <malloc.h>
 #    define alloca _alloca
 #  else
-#    ifdef JEMALLOC_HAS_ALLOCA_H
+#    ifdef HAVE_ALLOCA_H
 #      include <alloca.h>
 #    else
 #      include <stdlib.h>