Eliminate name clash with system signal.h header file.

Tried to solve the signal.h name clash by using #include_next, but
seeing as this is not recommended[1] and breaks builds on some cross
compilers, the files were simply renamed: signal.[ch] --> sig.[ch]

[1] - http://gcc.gnu.org/onlinedocs/cpp/Wrapper-Headers.html

Signed-off-by: Joachim Nilsson <troglobit@gmail.com>

Makefile

@@ -29,11 +29,11 @@ ROOTDIR    ?= $(shell pwd)
 PLUGIN_DIR ?= /lib/finit/plugins
 
 #VERSION    ?= $(shell git tag -l | tail -1)
-VERSION    ?= 1.0
+VERSION    ?= 1.1-pre
 EXEC        = finit
 PKG         = $(EXEC)-$(VERSION)
 ARCHIVE     = $(PKG).tar.xz
-OBJS        = finit.o conf.o helpers.o signal.o svc.o plugin.o
+OBJS        = finit.o conf.o helpers.o sig.o svc.o plugin.o
 OBJS       += strlcpy.o
 SRCS        = $(OBJS:.o=.c)
 DEPS        = $(addprefix .,$(SRCS:.c=.d))

finit.c

@@ -33,7 +33,7 @@
 #include "private.h"
 #include "plugin.h"
 #include "svc.h"
-#include "signal.h"
+#include "sig.h"
 
 int   debug    = 0;
 int   verbose  = 1;

helpers.c

@@ -47,7 +47,7 @@
 #include "finit.h"
 #include "helpers.h"
 #include "private.h"
-#include "signal.h"
+#include "sig.h"
 
 #define NUM_ARGS    16
 #define NUM_SCRIPTS 128		/* ought to be enough for anyone */

plugins/initctl.c

@@ -23,11 +23,11 @@
  */
 
 #include <errno.h>
+#include <signal.h>
 #include <string.h>
 
 #include "finit.h"
 #include "plugin.h"
-#include "signal.h"
 
 #define INIT_MAGIC		0x03091969
 #define INIT_CMD_RUNLVL		1

sig.c

@@ -38,7 +38,6 @@
  *	      It activates the kbrequest action.
  */
 
-#include <signal.h>
 #include <sys/reboot.h>
 #include <sys/wait.h>
 
@@ -46,7 +45,7 @@
 #include "helpers.h"
 #include "plugin.h"
 #include "private.h"
-#include "signal.h"
+#include "sig.h"
 
 static int stopped = 0;
 

sig.h

@@ -22,10 +22,10 @@
  * THE SOFTWARE.
  */
 
-#ifndef FINIT_SIGNAL_H_
-#define FINIT_SIGNAL_H_
+#ifndef FINIT_SIG_H_
+#define FINIT_SIG_H_
 
-#include_next <signal.h>
+#include <signal.h>
 
 #define SYNC_SHUTDOWN   "/var/lock/finit.shutdown"
 #define SYNC_STOPPED    "/var/lock/finit.stopped"
@@ -59,7 +59,7 @@ int  sig_stopped    (void);
 void sig_init       (void);
 void sig_setup      (void);
 
-#endif /* FINIT_SIGNAL_H_ */
+#endif /* FINIT_SIG_H_ */
 
 /**
  * Local Variables:

svc.c

@@ -28,7 +28,7 @@
 #include "finit.h"
 #include "helpers.h"
 #include "private.h"
-#include "signal.h"
+#include "sig.h"
 #include "svc.h"
 
 /* The registered services are kept in shared memory for easy read-only access