android: Remove/filter header files from LOCAL_SRC_FILES

This avoids huge warnings when building the native code.

src/libcharon/Android.mk

@@ -2,7 +2,7 @@ LOCAL_PATH := $(call my-dir)
 include $(CLEAR_VARS)
 
 # copy-n-paste from Makefile.am
-LOCAL_SRC_FILES := \
+libcharon_la_SOURCES := \
 bus/bus.c bus/bus.h \
 bus/listeners/listener.h \
 bus/listeners/logger.h \
@@ -77,7 +77,7 @@ sa/shunt_manager.c sa/shunt_manager.h \
 sa/trap_manager.c sa/trap_manager.h \
 sa/task.c sa/task.h
 
-LOCAL_SRC_FILES += \
+libcharon_la_SOURCES += \
 sa/ikev2/keymat_v2.c sa/ikev2/keymat_v2.h \
 sa/ikev2/task_manager_v2.c sa/ikev2/task_manager_v2.h \
 sa/ikev2/authenticators/eap_authenticator.c sa/ikev2/authenticators/eap_authenticator.h \
@@ -100,7 +100,7 @@ sa/ikev2/tasks/ike_reauth.c sa/ikev2/tasks/ike_reauth.h \
 sa/ikev2/tasks/ike_auth_lifetime.c sa/ikev2/tasks/ike_auth_lifetime.h \
 sa/ikev2/tasks/ike_vendor.c sa/ikev2/tasks/ike_vendor.h
 
-LOCAL_SRC_FILES += \
+libcharon_la_SOURCES += \
 sa/ikev1/keymat_v1.c sa/ikev1/keymat_v1.h \
 sa/ikev1/task_manager_v1.c sa/ikev1/task_manager_v1.h \
 sa/ikev1/authenticators/psk_v1_authenticator.c sa/ikev1/authenticators/psk_v1_authenticator.h \
@@ -123,6 +123,8 @@ sa/ikev1/tasks/mode_config.c sa/ikev1/tasks/mode_config.h \
 processing/jobs/dpd_timeout_job.c processing/jobs/dpd_timeout_job.h \
 processing/jobs/adopt_children_job.c processing/jobs/adopt_children_job.h
 
+LOCAL_SRC_FILES := $(filter %.c,$(libcharon_la_SOURCES))
+
 # adding the plugin source files
 
 LOCAL_SRC_FILES += $(call add_plugin, android-dns)