Enable target with headers but no sources as ClangTarget
#6006
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This PR change allows the generation of targets containing only header files.
Motivation:
Closes #4806 .
Currently, if we attempt to create a target that does not contain source files, the Swift Package Manager returns an error and prompts us to put the source files. Therefore, it is not possible to create a CLangTarget that only contains header files.
Modifications:
Changed so that if a header file exists, the Target generation process continues even if no source file exists.
Result:
With the changes in this PR, a target that does not contain source files but does contain headers is a CLangTarget.