Description
Some mixed precision clean up of the build systems and macros. Removes the mixed mode option from autotools(always compiles r8 default).

I was unsure whether to change the CMake builds kind options just yet. Since it builds a distinct copy of the library per kind option enabled, this will cause issues in existing cmake builds since the library name includes the kind default. The r4/r8 libraries should both support mixed precision regardless of default so we may want to test with that first and then modify to only build with r8_kind (current cmake default is to only build with r4_kind).

Also cleans up some macros:

• use_Netcdf was removed; it was always set by autotools and only used in the diag manager
• NO_QUAD_PRECISION was already not in the code, just removed it from platform.h in favor of ENABLE_QUAD_PRECISION
• NO_F95 and NO_F2000 were removed, they set macros with the intention of being able to replace features from those fortrans standards (ie. macro _ALLOCATABLE that is set to either pointer or allocatable) but were removed
• no_4byte_reals was removed
• no_8byte_integers macro was left in since its not really related to the mixed precision updates. Complex overrides were left in as well.

Lastly I added a comment for the cray pointer flag since its only used in one module so can be misleading, and removed an unused include file that somehow snuck in.

partial fix for #1330 (leaving it open for cray pointer macros)

How Has This Been Tested?
make distcheck with oneapi 23 on amd

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included
• make distcheck passes