CMake sanitize leading define flag

[islas]

TYPE: bug fix

KEYWORDS: compilation, cmake

SOURCE: internal

DESCRIPTION OF CHANGES:
Problem:
With the addition of #2088, ARCH_LOCAL from the stanza is now being fed into compilation with potential -D defines. On versions of CMake <3.26 leading -D on defines is not removed from certain function calls like add_compile_definitions(). This will pass the configuration stage but will fail to compile when using the defined minimum CMake version of the project.

Solution:
To simplify the logic, all defines fed into the wrf_config.cmake file for the configuration step will be sanitized of leading -D. This follows the original design intent where stanza sanitization happens before being fed into CMake, thus allowing the CMake code to focus on configuration of options rather than translation of stanza into usable values.

TESTS CONDUCTED:

1. Tested configuration and compilation on CMake version v3.20.6

RELEASE NOTE:
Remove leading -D on defines during stanza reading to allow older versions of CMake to configure properly.

[weiwangncar]

The regression test results:

Test Type              | Expected  | Received |  Failed
= = = = = = = = = = = = = = = = = = = = = = = =  = = = =
Number of Tests        : 23           24
Number of Builds       : 60           57
Number of Simulations  : 158           150        0
Number of Comparisons  : 95           86        0

Failed Simulations are: 
None
Which comparisons are not bit-for-bit: 
None