[foreign-memaccess+abi] RFR: Remove printf and vprintf tests [v4]

[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.

Jorn Vernee has updated the pull request incrementally with one additional commit since the last revision:

  Remove spurious code

-------------

Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/536/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/536/files/a0cf834b..0546b4d1

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=536&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=panama-foreign&pr=536&range=02-03

  Stats: 3 lines in 2 files changed: 0 ins; 3 del; 0 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