[Tile-serving] [openstreetmap/mod_tile] 0.7.1 Lost leading "/" from "/var/cache/renderd/tiles" (Issue #416)

[Hummeltech]

Are you building this yourself, or are you using the newly released `Debian Unstable` package? The change you're mentioning was made at the request of the Debian package maintainer, and as per CMake recommended usage. Using absolute paths when setting install target paths, such as `RENDERD_TILE_DIR`, causes issues when specifying custom `CMAKE_INSTALL_*` paths during a package build using `DESTDIR`.

If you are using the `Debian Unstable` package, the default value for `RENDERD_TILE_DIR` is absolute (which is generated from `CMAKE_INSTALL_LOCALSTATEDIR` + `/cache/renderd/tiles` => `/var/cache/renderd/tiles`.)

However if you are building `mod_tile` yourself and not specifying an absolute path for `CMAKE_INSTALL_LOCALSTATEDIR` as updated in the documentation then it will default to `CMAKE_INSTALL_PREFIX` + `CMAKE_LOCALSTATEDIR` + `/cache/renderd/tiles` which will yield `/usr/local/var/cache/renderd/tiles`.

You can check what default value is compiled into your binary using `strings`:
```shell
$ strings /usr/lib/apache2/modules/mod_tile.so | grep cache/renderd/tiles
/var/cache/renderd/tiles
```

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