IntelPython / dpnp / 28538213326

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Strip GCC-only `-fno-merge-constants` from flags in conda build (#2978)

conda-forge's `gcc`/`g++` compiler activation injects
`-fno-merge-constants` into `CFLAGS`/`CXXFLAGS` when `CONDA_BUILD==1`.

The dpnp conda recipe builds with the Intel oneAPI compilers
(`icx`/`icpx`), which do not implement this GCC flag and emit a warning
on every compile unit:
```
icpx: command line warning #10430: Unsupported command line options encountered
These options as listed are not supported.
For more information, use '-qnextgen-diag'.
option list:
-fno-merge-constants
```

This PR removes `-fno-merge-constants` from `CFLAGS`/`CXXFLAGS` in
`conda-recipe/build.sh`.

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