Update debian/* to 4.5.18-1

* debian/changelog: Update to 4.5.18-1.
* debian/compat: Set compatibility level to 7.
* debian/control (Build-Depends): Update debhelper requirement.
(strace, strace64): Add Section and Priority tags.
diff --git a/debian/control b/debian/control
index 044f618..6ad7cb9 100644
--- a/debian/control
+++ b/debian/control
@@ -1,14 +1,16 @@
 Source: strace
-Section: utils
-Priority: standard
 Maintainer: Roland McGrath <frob@debian.org>
 Uploaders: Frederik Schüler <fs@debian.org>
-Build-Depends: libc6-dev (>= 2.2.2) [!alpha !ia64], libc6.1-dev (>= 2.2.2) [alpha ia64], gcc-multilib [i386 powerpc s390 sparc], debhelper (>= 5.0.0)
+Section: utils
+Priority: standard
+Build-Depends: libc6-dev (>= 2.2.2) [!alpha !ia64], libc6.1-dev (>= 2.2.2) [alpha ia64], gcc-multilib [i386 powerpc s390 sparc], debhelper (>= 7.0.0)
 Standards-Version: 3.8.0
 Homepage: http://sourceforge.net/projects/strace/
 
 Package: strace
 Architecture: alpha amd64 arm armeb armel hppa i386 ia64 m68k mips mipsel powerpc ppc64 s390 s390x sh sparc
+Section: utils
+Priority: standard
 Depends: ${shlibs:Depends}
 Description: A system call tracer
  strace is a system call tracer, i.e. a debugging tool which prints out
@@ -22,6 +24,8 @@
 
 Package: strace64
 Architecture: i386 powerpc s390 sparc
+Section: utils
+Priority: extra
 Depends: ${shlibs:Depends}
 Description: A system call tracer for 64bit binaries
  strace is a system call tracer, i.e. a debugging tool which prints out