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glcpp: consistently print warnings after shader

Alex requested to merge alxu/mesa:glcpp-fflush into main

otherwise, the output order is unpredictable: when run from tests, glibc prints warnings then shader (as long as it's under a few thousand bytes), whereas musl prints shader and then warnings, causing tests to fail. when run interactively, both will print shader and then warnings.

alternatives considered:

  1. separate stdout and stderr in the test runner. adds complexity with little value, and the actual output order remains unpredictable.
  2. consistently print the warnings first, then the shader. requires less changes to the expected output, but is inconsistent with the assumed original intent of the code.

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