[PATCH v2 5/8] Add .shellcheckrc to ignore x-prefix warnings

shellcheck warns:
Avoid x-prefix in comparisons as it no longer serves a purpose.

While this is true, it also does not really harm - besides some
arguments about readability. As zsh fixed this only ~11 years ago, let's
keep it for some years but silence shellcheck.

Consensus on the mutt-dev ML was to keep using the x-prefix. Make sure
it is ignored no matter how we invoke shellcheck.
---
 .shellcheckrc | 2 ++
 1 file changed, 2 insertions(+)
 create mode 100644 .shellcheckrc

diff --git a/.shellcheckrc b/.shellcheckrc
new file mode 100644
index 00000000..e840fbc1
--- /dev/null
+++ b/.shellcheckrc
@@ -0,0 +1,2 @@
+# SC2268 (style): Avoid x-prefix in comparisons as it no longer serves a purpose.
+disable=SC2268
-- 
2.51.0