Explicitly give the path of the library to build.

Otherwise the build system would not build the 32bit version
for ART 32 bit.

Change-Id: Ie2b48bb94d4fc9ce1a9590c1e8bacd382db16d8c
diff --git a/tools/buildbot-build.sh b/tools/buildbot-build.sh
index b84ae47..62fd67b 100755
--- a/tools/buildbot-build.sh
+++ b/tools/buildbot-build.sh
@@ -19,7 +19,7 @@
   exit 1
 fi
 
-common_targets="vogar vogar.jar core-tests apache-harmony-jdwp-tests-hostdex out/host/linux-x86/bin/adb jsr166-tests libjavacoretests"
+common_targets="vogar vogar.jar core-tests apache-harmony-jdwp-tests-hostdex out/host/linux-x86/bin/adb jsr166-tests"
 android_root="/data/local/tmp/system"
 linker="linker"
 mode="target"
@@ -60,7 +60,7 @@
 done
 
 if [[ $mode == "host" ]]; then
-  make_command="make $j_arg build-art-host-tests $common_targets"
+  make_command="make $j_arg build-art-host-tests $common_targets out/host/linux-x86/lib/libjavacoretests.so out/host/linux-x86/lib64/libjavacoretests.so"
   echo "Executing $make_command"
   $make_command
 elif [[ $mode == "target" ]]; then
@@ -70,7 +70,7 @@
   # Use '-e' to force the override of TARGET_GLOBAL_LDFLAGS.
   # Also, we build extra tools that will be used by tests, so that
   # they are compiled with our own linker.
-  make_command="make -e $j_arg build-art-target-tests $common_targets libjavacrypto linker toybox toolbox sh"
+  make_command="make -e $j_arg build-art-target-tests $common_targets libjavacrypto libjavacoretests linker toybox toolbox sh"
   echo "Executing env $env $make_command"
   env $env $make_command
 fi