Check for 'git' before fetching/building grammars (#7320)

Previously the error message for this potential failure-case was
confusing: "no such file or directory". `hx -g fetch`, `hx -g build` and
the helix-term builder should bail early if the git binary is not
available.

1 files changed, 1 insertions, 0 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 182eed9e..d86ba955 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1167,6 +1167,7 @@ dependencies = [
  "threadpool",
  "toml",
  "tree-sitter",
+ "which",
 ]
 
 [[package]]