sysutils/shim: update from 0.8 to 0.9

• adopt the port;
• original version from PR 231029 was modified;
• add compiler, and shebangfix to USES;
• reorder variables in Makefile (silent portlint);
• rework do-install.

PR: 231029
Reviewed by: fernape, mat, tcberner, trasz
Approved by: rene (mentor)
Differential Revision: https://reviews.freebsd.org/D17019