debuild: fix broken dh-python dependency.

This is broken right now in Testing and Unstable, the fix should still
work in Debian Stretch, Ubuntu Xenial and later.

debuild/debian/control

@@ -2,7 +2,7 @@ Source: purr-data
 Section: sound
 Priority: extra
 Maintainer: Albert Graef <aggraef@gmail.com>
-Build-Depends: debhelper (>= 7.0.50~), autoconf, automake, libtool, pkg-config, bison, flex, libgtk2.0-dev, libgtk-3-dev, python-dev, dh-python | python-support, flite1-dev, ladspa-sdk, libasound2-dev, libjack-dev, libbluetooth-dev, libcairo2-dev, libgl1-mesa-dev | libgl-dev, libglew1.6-dev | libglew-dev, libgsl-dev | libgsl0-dev, libmagick++-dev, libavifile-0.7-dev, libdc1394-22-dev, libfftw3-dev, libfluidsynth-dev, libftgl-dev, libgmerlin-avdec-dev, libgsm1-dev, libjpeg-dev, liblua5.3-dev | liblua5.2-dev, libmp3lame-dev, libmpeg3-dev, libquicktime-dev, libraw1394-dev, libsmpeg-dev, libspeex-dev, libstk0-dev, libtiff5-dev, libv4l-dev, libdv4-dev, libiec61883-dev, libxv-dev, libxxf86vm-dev, libvorbis-dev, zlib1g-dev (>= 1:1.1.3), rsync, libgconf2-dev, libnss3-dev, libxtst-dev, libxss-dev
+Build-Depends: debhelper (>= 7.0.50~), autoconf, automake, libtool, pkg-config, bison, flex, libgtk2.0-dev, libgtk-3-dev, python2-dev | python-dev, dh-python, flite1-dev, ladspa-sdk, libasound2-dev, libjack-dev, libbluetooth-dev, libcairo2-dev, libgl1-mesa-dev | libgl-dev, libglew1.6-dev | libglew-dev, libgsl-dev | libgsl0-dev, libmagick++-dev, libavifile-0.7-dev, libdc1394-22-dev, libfftw3-dev, libfluidsynth-dev, libftgl-dev, libgmerlin-avdec-dev, libgsm1-dev, libjpeg-dev, liblua5.3-dev | liblua5.2-dev, libmp3lame-dev, libmpeg3-dev, libquicktime-dev, libraw1394-dev, libsmpeg-dev, libspeex-dev, libstk0-dev, libtiff5-dev, libv4l-dev, libdv4-dev, libiec61883-dev, libxv-dev, libxxf86vm-dev, libvorbis-dev, zlib1g-dev (>= 1:1.1.3), rsync, libgconf2-dev, libnss3-dev, libxtst-dev, libxss-dev
 Standards-Version: 3.9.5
 Homepage: https://git.purrdata.net/jwilkes/purr-data