Support change to system libpcre in debian

debian/bootstrap.sh

@@ -283,6 +283,7 @@ Build-Depends:
 # core build
  dpkg-dev (>= 1.15.8.12), gcc (>= 4:4.4.5), g++ (>= 4:4.4.5),
  libc6-dev (>= 2.11.3), make (>= 3.81),
+ libpcre3-dev,
  wget, pkg-config,
 # core codecs
  libogg-dev,