Revert "Refine the makefiles."

This reverts commit fa52e2083927dd4ea543528c557d52ab578ad34c.
diff --git a/libbcc-build-rules.mk b/libbcc-build-rules.mk
new file mode 100644
index 0000000..a065ed6
--- /dev/null
+++ b/libbcc-build-rules.mk
@@ -0,0 +1,51 @@
+#
+# Copyright (C) 2011 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+
+#=====================================================================
+# Architecture Selection
+#=====================================================================
+
+ifeq ($(LOCAL_IS_HOST_MODULE),) # Target Build
+
+  # Note: We should only use -DFORCE_ARCH_CODEGEN on target build.
+  # For the host build, we will include as many architecture as possible,
+  # so that we can test the execution engine easily.
+
+  ifeq ($(TARGET_ARCH),arm)
+    LOCAL_CFLAGS += -DFORCE_ARM_CODEGEN
+    ifeq ($(ARCH_ARM_HAVE_VFP),true)
+      LOCAL_CFLAGS += -DARCH_ARM_HAVE_VFP
+      ifeq ($(ARCH_ARM_HAVE_VFP_D32),true)
+        LOCAL_CFLAGS += -DARCH_ARM_HAVE_VFP_D32
+      endif
+    endif
+    ifeq ($(ARCH_ARM_HAVE_NEON),true)
+      LOCAL_CFLAGS += -DARCH_ARM_HAVE_NEON
+    endif
+  else
+    ifeq ($(TARGET_ARCH),mips)
+      LOCAL_CFLAGS += -DFORCE_MIPS_CODEGEN
+    else
+      ifeq ($(TARGET_ARCH),x86)
+        LOCAL_CFLAGS += -DFORCE_X86_CODEGEN
+      else
+        $(error Unsupported architecture $(TARGET_ARCH))
+      endif
+    endif
+  endif
+
+endif