configure enable xs fails because Texinfo/ModulePath.pm not found

[Patrice Dumas]

Hello,

A ./configure in a devel pristine source shows

Can't locate Texinfo/ModulePath.pm in @INC (you may need to install the 
Texinfo::ModulePath module) (@INC contains: . ../.. 
/home/dumas/perl5/lib/perl5//x86_64-linux-gnu-thread-multi 
/home/dumas/perl5/lib/perl5/ 
/home/dumas/src/mini_ker_install/share/perl/5.32.1/ /etc/perl 
/usr/local/lib/x86_64-linux-gnu/perl/5.34.0 /usr/local/share/perl/5.34.0 
/usr/lib/x86_64-linux-gnu/perl5/5.34 /usr/share/perl5 
/usr/lib/x86_64-linux-gnu/perl-base /usr/lib/x86_64-linux-gnu/perl/5.34 
/usr/share/perl/5.34 /usr/local/lib/site_perl) at ../../Texinfo/XSLoader.pm 
line 24.
Compilation failed in require at ../../Texinfo/XS/TestXS.pm line 23.
BEGIN failed--compilation aborted at ../../Texinfo/XS/TestXS.pm line 31.

for the TestXS test, because tp/Texinfo/XS/TestXS.pm requires Texinfo::XSLoader
which also require Texinfo::ModulePath, but at that point there is only
tp/Texinfo/ModulePath.pm.in since tp/Texinfo/ModulePath.pm is created by
a make run.

I am not sure about the best way to fix this, maybe move the relevant
parts of Texinfo::XSLoader in Texinfo/XS/TestXS.pm, or have fallback
values for $Texinfo::ModulePath::texinfo_uninstalled and
$Texinfo::ModulePath::builddir if the require Texinfo::ModulePath; fails
set in a BEGIN block.

-- 
Pat