Add aarch64 R package installation warning

[dominikWin]

There is an issue when installing the duckdb R package on aarch64 systems. For example, on Apple Silicon this:

docker run --rm -it debian:latest

apt update && apt install -y r-base build-essential
R -e "install.packages('duckdb')"

fails with this error:

database.o: in function `cpp11::._anon_102::get_preserve_list()':
/tmp/Rtmp2GQPNE/R.INSTALL1b663a54c21c/duckdb/src/../inst/include/cpp11/protect.hpp:397:(.text+0x78): relocation truncated to fit: R_AARCH64_LD64_GOTPAGE_LO15 against symbol `R_NilValue' defined in .bss section in /usr/lib/R/lib/libR.so
/usr/bin/ld: database.o: in function `get_preserve_xptr_addr':
/tmp/Rtmp2GQPNE/R.INSTALL1b663a54c21c/duckdb/src/../inst/include/cpp11/protect.hpp:397: warning: too many GOT entries for -fpic, please recompile with -fPIC
collect2: error: ld returned 1 exit status
make: *** [/usr/share/R/share/make/shlib.mk:10: duckdb.so] Error 1
ERROR: compilation failed for package 'duckdb'

This is because some distro's R installs, including Debian's, override the make CXX flags to -fpic instead of -fPIC which causes compilation failure on aarch64. Here is the relevant duckdb issue: duckdb/duckdb#3049. This is not a fault in duckdb, but rather of R's package installer. Ideally this would be fixed in the distros packages or R, but even if done so that would take a while to roll out.

This PR adds this warning to the R package install page (in a similar way to #2757):

On aarch64, if the DuckDB R package does not successfully compile, you may need to change your R environment's make variables.

[szarnyasg]

Thanks, this is a great suggestion! I'll set the link to the https://duckdb.org/docs/dev/building/troubleshooting page but otherwise it's good to go in.