[foreign-memaccess+abi] RFR: Remove printf and vprintf tests

[Jorn Vernee]

This patch removes the printf and vprintf tests, since the symbols are not available on Windows in the UCRT.

gmtime is similarly an inline function that maps to something else, but in that case there is a drop-in replacement symbol name _gmtime64 we can call instead.

This fixes the missing symbol errors in StdLibTest.

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Commit messages:
 - Remove printf and vprintf tests since those functions are not available in ucrt on Windows.

Changes: https://git.openjdk.java.net/panama-foreign/pull/536/files
 Webrev: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=536&range=00
  Stats: 122 lines in 2 files changed: 3 ins; 118 del; 1 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/536.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/536/head:pull/536

PR: https://git.openjdk.java.net/panama-foreign/pull/536