[r] Resolve interaction between `ccache` and package build

Follow-on from https://github.com/chanzuckerberg/cellxgene-census/issues/809.

Repro:

```
docker run --rm -ti eddelbuettel/r2u:jammy
apt-get update
apt-get install -y cmake git ccache

Rscript -e 'install.packages("tiledbsoma", repos = c("https://tiledb-inc.r-universe.dev", "https://cloud.r-project.org"))'
Rscript -e 'update.packages(ask=FALSE)'
Rscript -e 'remotes::install_github(repo="TileDB-Inc/TileDB-R@0.20.3")'
Rscript -e 'tiledbsoma::show_package_versions()'
```

If `~/.R/Makevars` does not exist, or lacks `ccache` lines, this works as intended. However, in the following scenario

```
$ cat ~/.R/Makevars
#VER=-13
CCACHE=ccache
CC=$(CCACHE) gcc$(VER)
CXX=$(CCACHE) g++$(VER)
CXX11=$(CCACHE) g++$(VER) #-std=c++11
CXX14=$(CCACHE) g++$(VER) #-std=c++14
CXX17=$(CCACHE) g++$(VER) #-std=c++17
```

then
```
Rscript -e 'install.packages("tiledbsoma", repos = c("https://tiledb-inc.r-universe.dev", "https://cloud.r-project.org"))'
```
results in a compile error at the `spdlog` step which includes
```
  The C compiler

    "/usr/bin/ccache"

  is not able to compile a simple test program.
```

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[r] Resolve interaction between `ccache` and package build #1807

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[r] Resolve interaction between ccache and package build #1807

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[r] Resolve interaction between `ccache` and package build #1807