Drop Python 1.4 support from configure

[methane]

No description provided.

[codecov-io]

Codecov Report

Merging #2794 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2794      +/-   ##
==========================================
- Coverage   75.37%   75.36%   -0.02%     
==========================================
  Files          92       92              
  Lines      134495   134496       +1     
==========================================
- Hits       101373   101357      -16     
- Misses      33122    33139      +17

Impacted Files	Coverage Δ
src/message.c	74.56% <0%> (-0.25%)	⬇️
src/ex_cmds.c	79.46% <0%> (-0.23%)	⬇️
src/gui_gtk_x11.c	47.63% <0%> (-0.15%)	⬇️
src/channel.c	83.05% <0%> (-0.13%)	⬇️
src/term.c	60.41% <0%> (-0.11%)	⬇️
src/ex_cmds2.c	78.57% <0%> (-0.1%)	⬇️
src/if_py_both.h	76.59% <0%> (ø)	⬆️
src/terminal.c	69.55% <0%> (+0.04%)	⬆️
src/gui.c	47.78% <0%> (+0.05%)	⬆️
src/ui.c	46.54% <0%> (+0.07%)	⬆️
... and 1 more

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