message: Fix `make install` error from removed *.hh files.
  Issue Wasmer no longer installs *.hh files, so the wildcard can
  go away.
diff: @@ -637,7 +637,7 @@ install-wasmer:
  install -Dm755 target/release/wasmer $(DESTDIR)/bin/wasmer
  install-capi-headers:
  - for header in lib/c-api/*.{h,hh}; do install -Dm644 "$$header" $(DESTDIR)/include/$$(basename $$header); done
  + for header in lib/c-api/*.h; do install -Dm644 "$$header" $(DESTDIR)/include/$$(basename $$header); done
  install -Dm644 lib/c-api/README.md $(DESTDIR)/include/wasmer-README.md
  # Currently implemented for linux only. TODO
  