[foreign-jextract] [Rev 01] RFR: adding sqlite3 sample

[Athijegannathan Sundararajan]

> This demo uses the recent Cpointer, Cscope features.

Athijegannathan Sundararajan has updated the pull request incrementally with one additional commit since the last
revision:

  sqlite3_free should not be commented. Fixed free of wrong pointer.
  renamed errMsg as errMsgPtrPtr.

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Changes:
  - all: https://git.openjdk.java.net/panama-foreign/pull/193/files
  - new: https://git.openjdk.java.net/panama-foreign/pull/193/files/1ec9b306..1d3b72c3

Webrevs:
 - full: https://webrevs.openjdk.java.net/panama-foreign/193/webrev.01
 - incr: https://webrevs.openjdk.java.net/panama-foreign/193/webrev.00-01

  Stats: 23 lines in 2 files changed: 1 ins; 0 del; 22 mod
  Patch: https://git.openjdk.java.net/panama-foreign/pull/193.diff
  Fetch: git fetch https://git.openjdk.java.net/panama-foreign pull/193/head:pull/193

PR: https://git.openjdk.java.net/panama-foreign/pull/193