Disable XOM in libjni_jpegutil.

Disable execute-only memory layouts in libjni_jpegutil.

This relies on libjpeg_static_ndk, which contains some data mixed into
code and thus requires a readable .text.

Bug: 77958880
Test: make -j libjni_jpegutil ENABLE_XOM=true
Test: readelf -l $OUT/system/lib64/libjni_jpegutil.so
Change-Id: I0ef011a3325e97174e5b8d36bc104c8d482354ec