test,doc,sea: run SEA tests on ppc64

The recent Postject upgrade, nodejs#48072,
included a performance improvement for the injection operation
(see nodejs/postject#86), so now it might be
possible to run the SEA tests on the ppc64 architecture runners on
Jenkins, which was previously getting timed out.

Signed-off-by: Darshan Sen <raisinten@gmail.com>

doc/api/single-executable-applications.md

@@ -233,7 +233,7 @@ platforms:
 * Windows
 * macOS
 * Linux (all distributions [supported by Node.js][] except Alpine and all
- architectures [supported by Node.js][] except s390x and ppc64)
+ architectures [supported by Node.js][] except s390x)
 
 This is due to a lack of better tools to generate single-executables that can be
 used to test this feature on other platforms.

test/common/sea.js

@@ -40,10 +40,6 @@ function skipIfSingleExecutableIsNotSupported() {
  if (process.arch === 's390x') {
  common.skip('On s390x, postject fails with `memory access out of bounds`.');
  }
-
- if (process.arch === 'ppc64') {
- common.skip('On ppc64, this test times out.');
- }
  }
 }