The shellckeck running on this script warns about possible misuse of
curly braces literals, which is a common issue in various shell scripts.
This is commit is trying to avoid this warning by explicitly escaping
the curly braces in the pattern matching.
Reading the manual (at least for bash), the curly braces are not
"special characters" so they do not have to be escaped, but escaping
them should not cause any side effects if I am right.
In src/gpgrt-config line 68:
\${*}*)
^-- SC1083 (warning): This { is literal. Check expression (missing ;/\n?) or quote it.
^-- SC1083 (warning): This } is literal. Check expression (missing ;/\n?) or quote it.