file.c: move fallocate parser to a separate file

* fallocate.c: New file.
* Makefile.am (strace_SOURCES): Add it.
* file.c (sys_fallocate): Move to fallocate.c.
diff --git a/Makefile.am b/Makefile.am
index d250125..f4e7c77 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -25,6 +25,7 @@
 	count.c		\
 	desc.c		\
 	dirent.c	\
+	fallocate.c	\
 	fanotify.c	\
 	file.c		\
 	inotify.c	\