Prevent mangled URL in .pc file

[mavit]

Previously, the Makefile assumed that Git URLs were always “SSH style”, e.g., [email protected]:tree-sitter/tree-sitter-java.git. This change causes the right thing to be done when a normal URL is encountered, e.g. https://github.com/tree-sitter/tree-sitter-java.git.

Relates to https://bugzilla.redhat.com/show_bug.cgi?id=2193261

Checklist:

• All tests pass in CI.
• There are sufficient tests for the new fix/feature. There do not appear to be any existing tests for this.
• Grammar rules have not been renamed unless absolutely necessary.
• The conflicts section hasn't grown too much.
• The parser size hasn't grown too much (check the value of STATE_COUNT in src/parser.c).

[amaanq]

makes sense, thanks!