Merge bitcoin/bitcoin#21629: build: fix configuring when building depends with NO_BDB=1

a5491882a0 build: fix configuring when building depends with NO_BDB=1 (fanquake)

Pull request description:

  Currently, if you build depends using `NO_BDB=1` (only sqlite wallets), `./configure` will fail as it still tries to find bdb. i.e:
  ```bash
  make -C depends/ NO_QT=1 NO_BDB=1 NO_UPNP=1 NO_ZMQ=1 NO_NATPMP=1 -j8
  ...
  copying packages: native_b2 boost libevent sqlite

  ./autogen.sh
  ./configure --prefix=/home/ubuntu/bitcoin/depends/x86_64-pc-linux-gnu
  ...
  checking for Berkeley DB C++ headers... default
  configure: error: Found Berkeley DB other than 4.8, required for portable BDB wallets (--with-incompatible-bdb to ignore or --without-bdb to disable BDB wallet support)
  ```

  This PR fixes the build such that you can build depends, opting out of bdb, without opting out of wallets entirely, and still configure successfully. I think I've tested across most potential configurations. i.e:
  ```bash
   ./configure (bdb and sqlite on system)
  bdb & sqlite are both are available

  ./configure --without-bdb  (bdb and sqlite on system)
  only sqlite

  ./configure --without-sqlite  (bdb and sqlite on system)
  only bdb

  ./configure --disable-wallet  (bdb and sqlite on system)
  neither bdb or sqlite

  depends NO_WALLET=1
  ./configure --prefix=/bitcoin/depends/x86_64-apple-darwin19.6.0
  neither bdb or sqlite

  depends NO_BDB=1
  ./configure --prefix=/bitcoin/depends/x86_64-apple-darwin19.6.0
  only sqlite

  depends NO_SQLITE=1
  ./configure --prefix=/bitcoin/depends/x86_64-apple-darwin19.6.0
  only bdb

  depends
  ./configure --prefix=/bitcoin/depends/x86_64-apple-darwin19.6.0
  bdb and sqlite
  ```

ACKs for top commit:
  laanwj:
    Code review ACK a5491882a0
  jarolrod:
    ACK a5491882a0

Tree-SHA512: baf7d2543a401db0d846095415ff449c04ecfb4a74c734dc51e79453702f9051210daeef686970f11fcffd32cdfadbc58acd54f0706aceecfb3edb0ff17310d7

configure.ac

@@ -1326,9 +1326,11 @@ fi
 
 if test x$enable_wallet != xno; then
     dnl Check for libdb_cxx only if wallet enabled
-    BITCOIN_FIND_BDB48
-    if test x$suppress_external_warnings != xno ; then
+    if test "x$use_bdb" != "xno"; then
+      BITCOIN_FIND_BDB48
+      if test x$suppress_external_warnings != xno ; then
         BDB_CPPFLAGS=SUPPRESS_WARNINGS($BDB_CPPFLAGS)
+      fi
     fi
 
     dnl Check for sqlite3

depends/Makefile

@@ -34,6 +34,8 @@ BASE_CACHE ?= $(BASEDIR)/built
 SDK_PATH ?= $(BASEDIR)/SDKs
 NO_QT ?=
 NO_QR ?=
+NO_BDB ?=
+NO_SQLITE ?=
 NO_WALLET ?=
 NO_ZMQ ?=
 NO_UPNP ?=
@@ -233,6 +235,8 @@ $(host_prefix)/share/config.site : config.site.in $(host_prefix)/.stamp_$(final_
             -e 's|@no_qr@|$(NO_QR)|' \
             -e 's|@no_zmq@|$(NO_ZMQ)|' \
             -e 's|@no_wallet@|$(NO_WALLET)|' \
+            -e 's|@no_bdb@|$(NO_BDB)|' \
+            -e 's|@no_sqlite@|$(NO_SQLITE)|' \
             -e 's|@no_upnp@|$(NO_UPNP)|' \
             -e 's|@no_natpmp@|$(NO_NATPMP)|' \
             -e 's|@multiprocess@|$(MULTIPROCESS)|' \

depends/config.site.in

@@ -38,6 +38,14 @@ if test -z "$enable_wallet" && test -n "@no_wallet@"; then
   enable_wallet=no
 fi
 
+if test -z "$with_bdb" && test -n "@no_bdb@"; then
+  with_bdb=no
+fi
+
+if test -z "$with_sqlite" && test -n "@no_sqlite@"; then
+  with_sqlite=no
+fi
+
 if test -z "$enable_multiprocess" && test -n "@multiprocess@"; then
   enable_multiprocess=yes
 fi