RFR: remove blanks in output like "int x ( int y)"

[Weijun Wang]

Unless the spaces around "(" is a special style, this patch can clean (at least some of) them up.

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Commit messages:
 - remove blanks in output like "int x ( int y)"

Changes: https://git.openjdk.org/jextract/pull/82/files
 Webrev: https://webrevs.openjdk.org/?repo=jextract&pr=82&range=00
  Stats: 5 lines in 2 files changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jextract/pull/82.diff
  Fetch: git fetch https://git.openjdk.org/jextract pull/82/head:pull/82

PR: https://git.openjdk.org/jextract/pull/82