Hard-coded build/numbers in *-mutex packages

[jakirkham]

It appears there are build/numbers (though could be misreading this) that are hard-coded in the *-mutex packages. For example

xgboost-feedstock/recipe/meta.yaml

Lines 63 to 67 in 829bd2e

	- name: _py-xgboost-mutex
	version: 2.0
	build:
	string: cpu_0 # [cuda_compiler_version == "None"]
	string: gpu_0 # [cuda_compiler_version != "None"]

xgboost-feedstock/recipe/meta.yaml

Lines 138 to 142 in 829bd2e

	- name: _r-xgboost-mutex
	version: 2.0
	build:
	string: cpu_0 # [cuda_compiler_version == "None"]
	string: gpu_0 # [cuda_compiler_version != "None"]

Should these be templated with a number Jinja variable? Or do these serve some other purpose?

Edit: For context these were added in commit ( 6d81868 ) of PR ( #15 ) and have remained largely unchanged

[jakirkham]

Note this issue is still present. Though the code on these lines has changed

xgboost-feedstock/recipe/meta.yaml

Lines 87 to 90 in e759080

	- name: _py-xgboost-mutex
	version: 2.0
	build:
	string: {{ "cpu" if cuda_compiler == "None" else "gpu" }}_0

xgboost-feedstock/recipe/meta.yaml

Lines 187 to 190 in e759080

	- name: _r-xgboost-mutex
	version: 2.0
	build:
	string: {{ "cpu" if cuda_compiler == "None" else "gpu" }}_0