Merge bitcoin/bitcoin#25550: doc: remove note on arm cross-compilation from build-unix.md

f1c16ed733 doc: remove note on arm cross-compilation from build-unix.md (Jarol Rodriguez)

Pull request description:

  No reason to have this here with outdated information. We already point users to the depends readme, the doc cross builders should be pointed to, within this doc.

  Master: [render](https://github.com/bitcoin/bitcoin/blob/master/doc/build-unix.md)
  PR: [render](f1c16ed733/doc/build-unix.md)

ACKs for top commit:
  laanwj:
    ACK f1c16ed733

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@ -288,26 +288,3 @@ This example lists the steps necessary to setup and build a command line only di
./src/bitcoind
If you intend to work with legacy Berkeley DB wallets, see [Berkeley DB](#berkeley-db) section.
ARM Cross-compilation
-------------------
These steps can be performed on, for example, an Ubuntu VM. The depends system
will also work on other Linux distributions, however the commands for
installing the toolchain will be different.
Make sure you install the build requirements mentioned above.
Then, install the toolchain and curl:
sudo apt-get install g++-arm-linux-gnueabihf curl
To build executables for ARM:
cd depends
make HOST=arm-linux-gnueabihf NO_QT=1
cd ..
./autogen.sh
CONFIG_SITE=$PWD/depends/arm-linux-gnueabihf/share/config.site ./configure --enable-reduce-exports LDFLAGS=-static-libstdc++
make
For further documentation on the depends system see [README.md](../depends/README.md) in the depends directory.