`r-mixedcca` recipe should not be `noarch`

The mixedCCA R package uses Rcpp and requires compilation. The recently merged recipe, however, is configured for noarch build, which is incorrect. Attempting to use on osx-64 platform results in a dynamic library issue:

$ mamba create -yn foo r-base=4.1 r-mixedcca
$ mamba activate foo
(foo) $ R
> library(mixedCCA)
Loading required package: MASS
Error: package or namespace load failed for ‘mixedCCA’ in library.dynam(lib, package, package.lib):
 shared object ‘mixedCCA.dylib’ not found

Recommendation: The recipe should be reworked to compile for each target platform.

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