Android: add makefile and config.h

This is the porting of alsa-lib 1.2.5 to Android.

Signed-off-by: Chih-Wei Huang <cwhuang@linux.org.tw>

android/Android.mk

@@ -0,0 +1,54 @@
+#
+# Copyright (C) 2021 The Android-x86 Open Source Project
+#
+# Licensed under the GNU Lesser General Public License Version 2.1.
+# You may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.gnu.org/licenses/lgpl.html
+#
+
+LOCAL_PATH := $(dir $(call my-dir))
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := libasound
+LOCAL_MODULE_TAGS := optional
+LOCAL_MODULE_CLASS := SHARED_LIBRARIES
+
+intermediates := $(call local-generated-sources-dir)
+
+LOCAL_C_INCLUDES := $(LOCAL_PATH)include $(LOCAL_PATH)android
+LOCAL_EXPORT_C_INCLUDE_DIRS := $(intermediates) $(LOCAL_PATH)android
+
+LOCAL_CFLAGS := -DPIC -Wno-absolute-value -Wno-address-of-packed-member \
+	-Wno-missing-braces -Wno-missing-field-initializers \
+	-Wno-pointer-arith -Wno-sign-compare -Wno-unused-function \
+	-Wno-unused-const-variable -Wno-unused-parameter -Wno-unused-variable \
+	-finline-limit=300 -finline-functions -fno-inline-functions-called-once
+
+# list of files to be excluded
+EXCLUDE_SRC_FILES := \
+	src/alisp/alisp_snd.c \
+	src/compat/hsearch_r.c \
+	src/control/control_shm.c \
+	src/pcm/pcm_d%.c \
+	src/pcm/pcm_ladspa.c \
+	src/pcm/pcm_shm.c \
+	src/pcm/scopes/level.c \
+
+LOCAL_SRC_FILES := $(filter-out $(EXCLUDE_SRC_FILES),$(call all-c-files-under,src))
+
+GEN := $(intermediates)/alsa/asoundlib.h
+$(GEN): $(LOCAL_PATH)configure.ac
+	$(hide) mkdir -p $(@D)
+	cat $(<D)/include/asoundlib-head.h > $@; \
+	sed -n "/.*\(#include <[ae].*.h>\).*/s//\1/p" $< >> $@; \
+	cat $(<D)/include/asoundlib-tail.h >> $@
+	sed -n "/^AC_INIT.* \([0-9.]*\))/s//\#define SND_LIB_VERSION_STR \"\1\"/p" $< > $(@D)/version.h; \
+	ln -sf alsa/version.h $(@D)/..
+
+LOCAL_GENERATED_SOURCES := $(GEN)
+
+LOCAL_SHARED_LIBRARIES := libdl
+
+include $(BUILD_SHARED_LIBRARY)