update CMAKE_ARGS in one go in activate.bat

[h-vetinari]

In conda-forge/wxwidgets-feedstock#61 there's something very strange. The value of CMAKE_ARGS appears to get set correctly in activation

(%BUILD_PREFIX%) %SRC_DIR%>IF "1" == "1" (
set "CMAKE_ARGS=-DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=%PREFIX%\Library -DCMAKE_PROGRAM_PATH=%BUILD_PREFIX%\bin;%BUILD_PREFIX%\Scripts;%BUILD_PREFIX%\Library\bin;%PREFIX%\bin;%PREFIX%\Scripts;%PREFIX%\Library\bin"  
 set "CMAKE_ARGS=!CMAKE_ARGS! -DPython_FIND_REGISTRY=NEVER -DPython3_FIND_REGISTRY=NEVER" 
) 

(%BUILD_PREFIX%) %SRC_DIR%>IF NOT "win-64" == "win-64" (
set "CONDA_BUILD_CROSS_COMPILATION=1"  
 set "CMAKE_ARGS=-DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=%PREFIX%\Library -DCMAKE_PROGRAM_PATH=%BUILD_PREFIX%\bin;%BUILD_PREFIX%\Scripts;%BUILD_PREFIX%\Library\bin;%PREFIX%\bin;%PREFIX%\Scripts;%PREFIX%\Library\bin -DPython_FIND_REGISTRY=NEVER -DPython3_FIND_REGISTRY=NEVER -DCMAKE_SYSTEM_NAME=Windows -DCMAKE_SYSTEM_PROCESSOR=AMD64" 
)  else (set "CONDA_BUILD_CROSS_COMPILATION=0" ) 

(note: the second branch here is not taken, but I've pasted it because it shows the previously set value of CMAKE_ARGS)

but then when the build is invoked, CMAKE_ARGS is empty

(%BUILD_PREFIX%) %SRC_DIR%\build_>cmake <CMAKE_ARGS_SHOULD_BE_HERE>  -GNinja     -DCMAKE_INSTALL_PREFIX=%PREFIX%\Library     -DwxUSE_REGEX=sys       -DwxUSE_ZLIB=sys        -DwxUSE_EXPAT=sys       -DwxUSE_LIBJPEG=sys     -DwxUSE_LIBPNG=sys      -DwxUSE_LIBTIFF=sys     -DwxUSE_LIBLZMA=sys     -DwxBUILD_VENDOR=     .. 
-- Setting build type to 'Debug' as none was specified.         # should be 'Release'!

So instead of putting -DPython_FIND_REGISTRY=... on a separate line as done in #99 and fixed up in #101, let's just update it in one go.

Sorry for the thrashing, batch files are an apparently endless source of insanity that keeps uppercutting my jaw.

[conda-forge-admin]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe/meta.yaml) and found it was in an excellent condition.

I do have some suggestions for making it better though...

For recipe/meta.yaml:

• ℹ️ The recipe is not parsable by parser conda-souschef (grayskull). This parser is not currently used by conda-forge, but may be in the future. We are collecting information to see which recipes are compatible with grayskull.
• ℹ️ The recipe is not parsable by parser conda-recipe-manager. The recipe can only be automatically migrated to the new v1 format if it is parseable by conda-recipe-manager.

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[conda-forge-admin]

Hi! This is the friendly conda-forge automerge bot!

I considered the following status checks when analyzing this PR:

• linter: passed
• azure: passed

Thus the PR was passing and merged! Have a great day!