Merge bitcoin#25414: doc: Update Arch Linux build example

f67b6fc Update Arch Linux build example (Igor Bubelov)

Pull request description:

  The current build example has two issues:

  1. The claim that the wallet functionality will be missing is obsolete since Bitcoin Core can use SQLite, which is a hard dependency of `pacman` so we can assume that it's always present.
  2. Installing package groups such as `base-devel` adds some friction and uncertainty by forcing readers to choose which packages they need, interactively. Listing required deps explicitly speeds up the whole process, makes it more transparent and cuts the number of installed packages.

ACKs for top commit:
  laanwj:
    re-ACK f67b6fc

Tree-SHA512: c068dac5d244044827d5d94a4b48f239180301b6870dce31b003fa111a69f7e3a483681a7ea2b3d393d6791b40043685ce2fe62c338cce1b7e37a6db0f02b1a2

Author: laanwj

doc/build-unix.md

@@ -277,22 +277,17 @@ A list of additional configure flags can be displayed with:
 
 Setup and Build Example: Arch Linux
 -----------------------------------
-This example lists the steps necessary to setup and build a command line only, non-wallet distribution of the latest changes on Arch Linux:
+This example lists the steps necessary to setup and build a command line only distribution of the latest changes on Arch Linux:
 
-    pacman -S git base-devel boost libevent python
+    pacman --sync --needed autoconf automake boost gcc git libevent libtool make pkgconf python sqlite
     git clone https://github.com/bitcoin/bitcoin.git
     cd bitcoin/
     ./autogen.sh
-    ./configure --disable-wallet --without-gui --without-miniupnpc
+    ./configure
     make check
+    ./src/bitcoind
 
-Note:
-Enabling wallet support requires either compiling against a Berkeley DB newer than 4.8 (package `db`) using `--with-incompatible-bdb`,
-or building and depending on a local version of Berkeley DB 4.8. The readily available Arch Linux packages are currently built using
-`--with-incompatible-bdb` according to the [PKGBUILD](https://github.com/archlinux/svntogit-community/blob/packages/bitcoin/trunk/PKGBUILD).
-As mentioned above, when maintaining portability of the wallet between the standard Bitcoin Core distributions and independently built
-node software is desired, Berkeley DB 4.8 must be used.
-
+If you intend to work with legacy Berkeley DB wallets, see [Berkeley DB](#berkeley-db) section.
 
 ARM Cross-compilation
 -------------------