Add missing provide for LibreOffice on Fedora

Trying to replace the Fedora JDK RPMs with the adoptium provided, this requirement is not satisfied:
```
libjvm.so()(64bit) is needed by (installed) libreoffice-ure-1:24.8.4.2-2.fc41.x86_64
```

I guess LO should work with temurin-21, and it contains the `libjvm.so`:
```
$ rpm -ql temurin-21-jdk | grep libjvm
/usr/lib/jvm/temurin-21-jdk/lib/server/libjvm.so
```
but misses the virtual provides that the Fedora LO package expects:
```
$ rpm -q --provides temurin-21-jdk | grep jvm
# no result
```

A small test (force-removing `java-21-openjdk-headless`) shows that LO finds "Eclipse Adoptium" as JRE and extensions still seem to work.

Related to #848.