Drop a test

Which really tests array not siunitx: it tunrs out it
did pick something up! (latex3/latex2e#1378)

testfiles/siunitx-table-column.lvt

@@ -19,10 +19,6 @@
  1.23 & 4.56 & 7.89 \\
 \end{tabular}
 
-\begin{tabular}{X}
- 1.23 & 4.56 & 7.89 \\
-\end{tabular}
-
 \OMIT
 
 \end{document}

testfiles/siunitx-table-column.tlg

@@ -1,23 +1,2 @@
 This is a generated file for the l3build validation system.
 Don't change this file in any respect.
-! Package array Error: Illegal pream-token (X): `c' used.
-See the array package documentation for explanation.
-Type H <return> for immediate help.
- ... 
-l. ...\begin{tabular}{X}
-Try typing <return> to proceed.
-If that doesn't work, type X <return> to quit.
-! Extra alignment tab has been changed to \cr.
-<recently read> \endtemplate 
-l. ... 1.23 &
- 4.56 & 7.89 \\
-You have given more \span or & marks than there were
-in the preamble to the \halign or \valign now in progress.
-So I'll assume that you meant to type \cr instead.
-! Extra alignment tab has been changed to \cr.
-<recently read> \endtemplate 
-l. ... 1.23 & 4.56 &
- 7.89 \\
-You have given more \span or & marks than there were
-in the preamble to the \halign or \valign now in progress.
-So I'll assume that you meant to type \cr instead.