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Preprocessor fixes #23

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Preprocessor fixes #23

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byteit101
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  1. Don't delete the preprocessor file before running cpp
  2. Use the system temp dir, not the location (Fixes Preprocessor writes to file (or fails to) #4 )

I kept getting cpp complaining that the file couldn't be found under heavy IO load, and then realized this fix was necessary as the tempfile was being deleted before gcc could read it

gcc: error: /home/byteit101/project/cast-preprocessor-input.20221001-1388787-1lxyy5.c: No such file or directory
gcc: fatal error: no input files
compilation terminated.
Traceback (most recent call last):
	1: from test.rb:6:in `<main>'
/home/byteit101/rvm/gems/ruby-2.6.2/gems/cast-0.3.1/lib/cast/preprocessor.rb:40:in `preprocess': C::Preprocessor::Error

@byteit101
Preprocessor fixes
f1c61cb 
1. Don't delete the preprocessor file before running cpp
2. Use the system temp dir, not the location (Fixes oggy#4)
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Preprocessor writes to file (or fails to)
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@byteit101