Relax the constraint of 64bit build environment.

Change-Id: Id8be221dcfa07651a4d9a2776b00e907b4ff750e
diff --git a/core/config.mk b/core/config.mk
index a3bcbf1..f8bee80 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -267,6 +267,12 @@
 HOST_JDK_TOOLS_JAR:= $(shell $(BUILD_SYSTEM)/find-jdk-tools-jar.sh)
 endif
 
+# Is the host JDK 64-bit version?
+HOST_JDK_IS_64BIT_VERSION :=
+ifneq ($(filter 64-Bit, $(shell java -version 2>&1)),)
+HOST_JDK_IS_64BIT_VERSION := true
+endif
+
 # It's called md5 on Mac OS and md5sum on Linux
 ifeq ($(HOST_OS),darwin)
 MD5SUM:=md5 -q