contributing: remove BUILDING.md references

There were references to BUILDING.md in files which were ported from
mlkem. Change these to point towards the nix setup information in
CONTRIBUTING.md.

Signed-off-by: Andreas Hatziiliou <andreas.hatziiliou@savoirfairelinux.com>

Author: L-series

scripts/autogen

@@ -110,7 +110,7 @@ def finalize_format_batch(batch):
         if p.returncode != 0:
             print(p.stderr)
             print(
-                f"Failed to auto-format autogenerated code (clang-format return code {p.returncode}). Are you running in a nix shell? See BUILDING.md."
+                f"Failed to auto-format autogenerated code (clang-format return code {p.returncode}). Are you running in a nix shell? See CONTRIBUTING.md."
             )
             exit(1)
 
@@ -291,7 +291,7 @@ def format_content(content):
     if p.returncode != 0:
         print(p.stderr)
         print(
-            f"Failed to auto-format autogenerated code (clang-format return code {p.returncode}). Are you running in a nix shell? See BUILDING.md."
+            f"Failed to auto-format autogenerated code (clang-format return code {p.returncode}). Are you running in a nix shell? See CONTRIBUTING.md."
         )
         exit(1)
     return p.stdout

scripts/format

@@ -30,29 +30,29 @@ error()
 
 info "Formatting nix files"
 if ! command -v nixpkgs-fmt 2>&1 >/dev/null; then
-  error "nixpkgs-fmt not found. Are you running in a nix shell? See BUILDING.md."
+  error "nixpkgs-fmt not found. Are you running in a nix shell? See CONTRIBUTING.md."
   exit 1
 fi
 
 nixpkgs-fmt "$ROOT"
 
 info "Formatting shell scripts"
 if ! command -v shfmt 2>&1 >/dev/null; then
-  error "shfmt not found. Are you running in a nix shell? See BUILDING.md."
+  error "shfmt not found. Are you running in a nix shell? See CONTRIBUTING.md."
   exit 1
 fi
 shfmt -s -w -l -i 2 -ci -fn $(shfmt -f $(git grep -l '' :/))
 
 info "Formatting python scripts"
 if ! command -v black 2>&1 >/dev/null; then
-  error "black not found. Are you running in a nix shell? See BUILDING.md."
+  error "black not found. Are you running in a nix shell? See CONTRIBUTING.md."
   exit 1
 fi
 black --include "(scripts/tests|scripts/simpasm|scripts/cfify|scripts/autogen|scripts/check-namespace|\.py$)" "$ROOT"
 
 info "Formatting c files"
 if ! command -v clang-format 2>&1 >/dev/null; then
-  error "clang-format not found. Are you running in a nix shell? See BUILDING.md."
+  error "clang-format not found. Are you running in a nix shell? See CONTRIBUTING.md."
   exit 1
 fi