[patch] correctly detect 32bit platforms

[Matthias Klose]

Sorry if this is the wrong ML, but this results in hotspot build failures on 
various 32bit zero targets.

common/autoconf/boot-jdk.m4 uses BUILD_NUM_BITS to check for 32bit-ness, however 
this is nowhere defined.  the current macro seems to be OPENJDK_BUILD_CPU_BITS.

patch checked with b87.

Matthias
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Index: b/common/autoconf/boot-jdk.m4
===================================================================
--- a/common/autoconf/boot-jdk.m4
+++ b/common/autoconf/boot-jdk.m4
@@ -341,7 +341,7 @@ AC_DEFUN_ONCE([BOOTJDK_SETUP_BOOT_JDK_AR
   # Maximum amount of heap memory.
   # Maximum stack size.
   JVM_MAX_HEAP=`expr $MEMORY_SIZE / 2`
-  if test "x$BUILD_NUM_BITS" = x32; then
+  if test "x$OPENJDK_BUILD_CPU_BITS" = x32; then
     if test "$JVM_MAX_HEAP" -gt "1100"; then
       JVM_MAX_HEAP=1100
     elif test "$JVM_MAX_HEAP" -lt "512"; then