Bug#972089: Backport hplip 3.20.5 to buster-backports

[Alex ARNAUD <aarnaud@hypra.fr>]

    Package: hplip
    Severity: wishlist patch
    Tags: buster
    
    Hello,
    
    Why I'd like this to be backported to buster-backports ?
    My new printer, an HP 2700 series is only compatible with HP Lip
    3.20.5+. This is based on my own tests where only half of printed
    pages are printed. This is also based on the upstream
      table where it is indicated the "HP DeskJet 2700 All-in-One
    Printer series" is compatible with 3.20.5.
    
    What did I already do to figure this out?
    With the help of Samuel Thibault, I was able to recompile HP Lip
    3.20.5 on a Buster virtual machine and I produced two patch for it.
    The patches are attached to this mail. One is to update the
    debian/patches/series file and the second one is to refresh the
    patch 0072 (just a quilt refresh on it). I initially would like to
    propose a pull request on Salsa but there is no branch to submit the
    changes.
    
    What my patch does?
    It reverts all the python3.8 specific patches because Debian Buster
    is based on Python 3.7 and because python3.7 library is named
    "python3.7m", not only python3.7.
    
    What I think HP Lip should be backported to buster-backports?
    I think it'd be really helpful for people would like to stay on
    stable with new HP printers which require new HP Lip to have a new
    version in backports.
    
    How do I check if it works?
    1. I upgraded the compiled packages with the following command:
> sudo dpkg -iO .../*.deb
    
    2) I rebooted my virtual machine to ensure the new HP Lip version is
    loaded
    
    3) I configured my HP Desktop 3630 printer (launched with
    system-config-printer)
    
    4) I tried a print test job launched with system-config-printer
    
    5) I tried a scan with simple-scan
    
    Result:
    Everything seems to work correctly.
    
    Thanks in advance,
    Alex.
    
  

71d70
< 0071-Fix-building-with-Python-3.8.patch
73,74d71
< 0073-py3.8-Fix-SyntaxWarning-is-is-not-with-a-literal.patch
< 0074-py3.8-Assume-the-python3-distro-package-is-available.patch

13,17c13,17
< diff --git a/configure.in b/configure.in
< index 7f6982c..ced1f47 100755
< --- a/configure.in
< +++ b/configure.in
< @@ -604,20 +604,31 @@ if test "$class_driver" = "no" && test "$hpijs_only_build" = "no" && test "$hpcu
---
> Index: hplip-3.20.5+dfsg0/configure.in
> ===================================================================
> --- hplip-3.20.5+dfsg0.orig/configure.in
> +++ hplip-3.20.5+dfsg0/configure.in
> @@ -604,20 +604,31 @@ if test "$class_driver" = "no" && test "
61c61,62
< @@ -633,7 +644,6 @@ if test "$class_driver" = "no" && test "$hpijs_only_build" = "no" && test "$lite
---
> @@ -630,7 +641,6 @@ if test "$class_driver" = "no" && test "
>     AS_IF([test "x$FOUND_HEADER" != "xyes"],
63d63
<     CPPFLAGS=$save_CPPFLAGS