Use some Makefile magic to determine if linux/compiler.h is present. (issue #10174 reported by francesco_r)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.2@74587 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/Makefile

@@ -79,6 +79,10 @@ ifneq ($(wildcard $(CROSS_COMPILE_TARGET)/usr/include/linux/ixjuser.h)$(wildcard
   CHANNEL_LIBS+=chan_phone.so
 endif
 
+ifneq ($(wildcard $(CROSS_COMPILE_TARGET)/usr/include/linux/compiler.h),)
+  CFLAGS+=-DHAVE_LINUX_COMPILER_H
+endif
+
 ifneq ($(wildcard h323/libchanh323.a),)
   CHANNEL_LIBS+=chan_h323.so
 endif

channels/chan_phone.c

@@ -34,6 +34,9 @@
 #include <arpa/inet.h>
 #include <fcntl.h>
 #include <sys/ioctl.h>
+#ifdef HAVE_LINUX_COMPILER_H
+#include <linux/compiler.h>
+#endif
 #include <linux/telephony.h>
 /* Still use some IXJ specific stuff */
 #include <linux/version.h>