macOS fix: Add excludes for checks added in the newer shellcheck vers…

…ion installed by brew

test/lint/lint-shell.sh

@@ -16,7 +16,14 @@ if [ "$TRAVIS" = "true" ]; then
   unset LC_ALL
 fi
 
+if ! command -v shellcheck > /dev/null; then
+    echo "Skipping shell linting since shellcheck is not installed."
+    exit 0
+fi
+
 # Disabled warnings:
+# SC1087: Use braces when expanding arrays, e.g. ${array[idx]} (or ${var}[.. to quiet).
+# SC1117: Backslash is literal in "\.". Prefer explicit escaping: "\\.".
 # SC2001: See if you can use ${variable//search/replace} instead.
 # SC2004: $/${} is unnecessary on arithmetic variables.
 # SC2005: Useless echo? Instead of 'echo $(cmd)', just use 'cmd'.
@@ -33,5 +40,8 @@ fi
 # SC2166: Prefer [ p ] && [ q ] as [ p -a q ] is not well defined.
 # SC2166: Prefer [ p ] || [ q ] as [ p -o q ] is not well defined.
 # SC2181: Check exit code directly with e.g. 'if mycmd;', not indirectly with $?.
-shellcheck -e SC2001,SC2004,SC2005,SC2006,SC2016,SC2028,SC2046,SC2048,SC2066,SC2086,SC2116,SC2148,SC2162,SC2166,SC2181 \
+# SC2206: Quote to prevent word splitting, or split robustly with mapfile or read -a.
+# SC2207: Prefer mapfile or read -a to split command output (or quote to avoid splitting).
+# SC2230: which is non-standard. Use builtin 'command -v' instead.
+shellcheck -e SC1087,SC1117,SC2001,SC2004,SC2005,SC2006,SC2016,SC2028,SC2046,SC2048,SC2066,SC2086,SC2116,SC2148,SC2162,SC2166,SC2181,SC2206,SC2207,SC2230 \
     $(git ls-files -- "*.sh" | grep -vE 'src/(secp256k1|univalue)/')