Added an Android.mk file to enable Android builds.

See linphone-android repo.

Android.mk

+LOCAL_PATH:= $(call my-dir)
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := libmsisac
+
+ISAC_SRC_DIR    = $(LOCAL_PATH)/../externals/webrtc
+
+LOCAL_SRC_FILES := isac_enc.c isac_dec.c
+
+LOCAL_C_INCLUDES += $(ISAC_SRC_DIR) \
+    $(ISAC_SRC_DIR)/modules/audio_coding/codecs/isac/fix/source     \
+    $(ISAC_SRC_DIR)/modules/audio_coding/codecs/isac/fix/util 		\
+    $(ISAC_SRC_DIR)/modules/audio_coding/codecs/isac/fix/interface 	\
+	$(ISAC_SRC_DIR)/common_audio/signal_processing/include          \
+	$(LOCAL_PATH)/../linphone/oRTP/include                          \
+	$(LOCAL_PATH)/../linphone/mediastreamer2/include
+
+include $(BUILD_STATIC_LIBRARY)
+
+

Makefile.am

@@ -2,7 +2,7 @@ EXTRA_DIST=autogen.sh msisac.iss.in
 isac_VERSION = 1.0.0
 isac_DIR=$(top_builddir)/webrtc
 
-# ISAC_FLAVOUR = main # use 'main' or 'fix'
+ISAC_FLAVOUR ?= fix # use 'main' or 'fix'
 ISAC_SRC_DIR = webrtc/modules/audio_coding/codecs/isac/$(ISAC_FLAVOUR)
 ISAC_COMMON_DIR = webrtc/common_audio/signal_processing