debian: use libjpeg62-dev rather than libjpeg8-dev

Some modules such as mod_h323 pull in libjpeg62-dev which creates a
dependency conflict if we try to use libjpeg8-dev for the core.

debian/bootstrap.sh

@@ -168,7 +168,7 @@ Build-Depends:
  wget, pkg-config,
 # configure options
  libssl-dev, unixodbc-dev,
- libncurses5-dev, libjpeg8-dev,
+ libncurses5-dev, libjpeg62-dev,
  python-dev, erlang-dev,
 # documentation
  doxygen,