Cleanup spkg-configure.m4 files that mix tabs and spaces

[slel]

The spkg-configure files for the following packages
mix tabs and spaces:
arb brial cmake flint gcc gfortran git gmp iml
ninja_build pari patch pcre ppl python3 symmetrica.

This ticket is to make them use spaces only.

Note however discussion at #13899 warns against
changing whitespace in a lot of files at once.

CC: @dimpase @embray @orlitzky @mkoeppe @slel

Component: build: configure

Author: Frédéric Chapoton, Michael Orlitzky

Branch/Commit: f9e58da

Reviewer: Michael Orlitzky, Dima Pasechnik

Issue created by migration from https://trac.sagemath.org/ticket/31528

[mkoeppe]

comment:1

Sage development has entered the release candidate phase for 9.3. Setting a new milestone for this ticket based on a cursory review of ticket status, priority, and last modification date.

[slel]

comment:2

Previous related tickets:

• Cksum uses tabs instead of spaces, breaking sage-spkg's regex #15436: Cksum uses tabs instead of spaces, breaking sage-spkg's regex
• Don't use TAB characters for indentation #13899: Don't use TAB characters for indentation
• Removing tabs in .rst, .tex and .pxi files #13146: Removing tabs in .rst, .tex and .pxi files

This shell command spots files with tabs
when run from the Sage root folder:

$ git grep $'\t' . | cut -f 1 -d ":" | uniq \
  | grep -v Make | grep -v -e '^Binary' | grep -v patches

In Sage 9.3 it reveals:

bootstrap
build/bin/write-dockerfile.sh
build/pkgs/_prereq/distros/freebsd.txt
build/pkgs/arb/spkg-configure.m4
build/pkgs/brial/spkg-configure.m4
build/pkgs/bzip2/spkg-configure.m4
build/pkgs/cmake/spkg-configure.m4
build/pkgs/cvxopt/spkg-install.in
build/pkgs/ecm/spkg-install.in
build/pkgs/flint/spkg-configure.m4
build/pkgs/gcc/spkg-configure.m4
build/pkgs/gfortran/spkg-configure.m4
build/pkgs/git/spkg-configure.m4
build/pkgs/gmp/spkg-configure.m4
build/pkgs/iml/spkg-configure.m4
build/pkgs/ninja_build/spkg-configure.m4
build/pkgs/pari/spkg-configure.m4
build/pkgs/patch/spkg-configure.m4
build/pkgs/pcre/spkg-configure.m4
build/pkgs/ppl/spkg-configure.m4
build/pkgs/python3/spkg-configure.m4
build/pkgs/symmetrica/spkg-configure.m4
m4/ax_absolute_header.m4
m4/ax_compiler_vendor.m4
m4/ax_gcc_option.m4
m4/ax_gxx_option.m4
m4/ax_prog_perl_modules.m4
src/.relint.yml
src/doc/en/developer/portability_testing.rst
src/doc/en/reference/parallel/media/map_reduce_arch.fig
src/sage/ext_data/graphs/graph_plot_js.html
src/sage/ext_data/magma/latex/latex.m
src/sage/ext_data/pari/simon/ell.gp
src/sage/graphs/cliquer/cl.c
src/sage/groups/perm_gps/partn_ref2/refinement_generic.h
src/sage/modular/arithgroup/farey.cpp
src/sage/modular/arithgroup/farey.hpp
src/sage/modular/arithgroup/sl2z.hpp
src/sage/rings/polynomial/weil/power_sums.c
src/sage/rings/polynomial/weil/power_sums.h

[slel]

Description changed:

--- 
+++ 
@@ -1,5 +1,10 @@
 The spkg-configure files for the following packages
 mix tabs and spaces:
-arb brial cmake flint gcc gfortran git gmp iml ninja_build pari patch pcre ppl python3 symmetrica.
+arb brial cmake flint gcc gfortran git gmp iml
+ninja_build pari patch pcre ppl python3 symmetrica.
 
 This ticket is to make them use spaces only.
+
+Note however discussion at #13899 warns against
+changing whitespace in a lot of files at once.
+

[fchapoton]

comment:4

here is a branch

---

New commits:

30988c7

no tab in spkg-configure

[fchapoton]

Commit: 30988c7

[fchapoton]

Branch: u/chapoton/31528

[fchapoton]

Author: Frédéric Chapoton

[sagetrac-git]

Changed commit from 30988c7 to 2de538d

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. This was a forced push. New commits:

2de538d

trac 32401 change one doctest for acosh

[sagetrac-git]

Changed commit from 2de538d to 30988c7