Enable JVM also on macOS ARM64

My previous attempts of `make check` and running a --with-java build against
various Azul JDK 13--17 have always crashed with SIGBUS that smelled like our
uses of pthread_jit_write_protect_np in
bridges/source/cpp_uno/shared/vtablefactory.cxx colided with corresponding calls
in the in-process JVM, randomly(?) causing some attempts of running generated
code to SIGBUS.  (See the email thread starting at
<https://lists.freedesktop.org/archives/libreoffice/2020-December/086490.html>
"Using Java on macOS ARM64".)

But at least with the recent
<https://cdn.azul.com/zulu/bin/zulu17.0.63-ea-jdk17.0.0-ea.27-macosx_aarch64.zip>
on macOS 11.4, this appears to work reliably now:  Multiple `make check
screenshot` as well as some manual use of LibreOffice did not run into any such
issues.

Change-Id: I2b1327e7e877ed71420c174c1d88e68a96b3532e
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/118114
Tested-by: Jenkins
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>

jvmfwk/plugins/sunmajor/pluginlib/sunjre.cxx

@@ -59,7 +59,7 @@ char const* const* SunInfo::getRuntimePaths(int * size)
         "/bin/jrockit/jvm.dll",
         // The 64-bit JRE has the jvm in bin/server
         "/bin/server/jvm.dll"
-#elif defined MACOSX && defined X86_64
+#elif defined MACOSX
         // Oracle Java 7, under /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home
         "/lib/server/libjvm.dylib",
         "/lib/jli/libjli.dylib"