Revert "Switch to db5.3."

This reverts commit 97d9cd64.

The included patch has no effect on the linking strategy of the build.
The build system of postfix is unfortunately overly complicated for no
reason and other link flags need to be handed in over `AUXLIBS` and
header include locations via `CCARGS`.

PKGBUILD

@@ -19,7 +19,7 @@ license=(
 )
 depends=(glibc)
 makedepends=(
-  db5.3
+  db
   icu
   libldap
   libnsl
@@ -37,7 +37,6 @@ source=(
   https://de.postfix.org/ftpmirror/official/$pkgbase-$pkgver.tar.gz
   $pkgbase-$pkgver.tar.gz.sig::https://de.postfix.org/ftpmirror/official/$pkgbase-$pkgver.tar.gz.gpg2
   $pkgbase-3.5.8-main_defaults.patch
-  $pkgbase-3.8.4-db53.patch
   $pkgbase.service
   $pkgbase.sysusers
   $pkgbase.tmpfiles
@@ -45,14 +44,12 @@ source=(
 sha512sums=('5bae3d62e104714aead1fff28a595bab4315227382f53c8dae2a231f4240e31abda19c1e3befc1db4c89bc5d66c9a43830390365aadabdac5cf36b493c5c48c7'
             'SKIP'
             '7b2785aa8120ca3ff91b405baf675e9e11f8d58b18a9b842672e7ae30932febddac10556a70823d8746fcb160bceb4dbabdee45cf46b02fc0127057656fb85c4'
-            '9a431ce829355b259b6cb617e983ab96b370185280abcbcc82268c2e9fc4e9d34a215720e83e66a4fb30b7f7fc4293491ba9fe6077c326f2cec68d259c333e47'
             '27f54747ad480d65b560c9dbc97e12c6353e4bceca0ffe3e358e31de56db0ad79928164c9f8790c73a9f791daa378253d2ee29b5a766661778553ec889b2cf97'
             'a7f15970f613ae7b98ce1b84ca0a6034ce3cc7b2b9ce7160dad9731f740fb762f4a54f44acceb5f06f8744fa9e952b088086af8a69da388a600b742a3cda37f2'
             'd08574a6acd595fc146513c92dc1bb341c3432d67de1e93ab73a7ce60e385dd34f3a55e3d3d7aec5f358ac4aae260f028599ac47650ebc663cea3043a760a7bc')
 b2sums=('200ce3d72444da05e42fc8627002d53d68c1b3d78b7f74b0130ac958c23d16454783ef4849a8c9a4e3cba8ae36646e921f7e94ac4fb819b597e1a5ab1a875272'
         'SKIP'
         'b5f19e0619f1fb017cd889c14e341c21146b3afe7b9eefcdb7fb1eb83a357434b899d1e92f3ab0023c78ef8f2de6ae54c4599ee0f0bd04d257f4ca0a4dc9a16c'
-        '44c58ddcf8b2b7dd86c59c2aaf50c5656f86145c3d351ac819104d379516909a341509eefd371c33c51c10cbca5acf860a12a89d102d4fdb6d5a1add37176ac4'
         '02dd441cf6e4a7c2bc0de876f020b0784d811f77a5c6102dd075d67b07158dbc53c8b4d62bc8035283d4f349008574b1c3fac03f4519d56ffd809cb5bcfb7bea'
         'db58b7deb24cea16fb84f56680f0000683f72e11a95039969878e3819607aad5e65af9d9f50007e7710609065c0e3ebb9b30c1d929162b74eca5e74434d82cf1'
         'de31693cea5f452a9c8c0d1cf5210a6e67c0176f8b1a4d74106f2e803911569e9fdbb2301b3b5dc7ad6a6da285026b1a3ed3de52117d216b030cf0d92348909d')
@@ -71,9 +68,6 @@ _pick() {
 prepare() {
   # add distribution defaults to main.cf (alias_maps and alias_database)
   patch -Np1 -d $pkgbase-$pkgver -i ../$pkgbase-3.5.8-main_defaults.patch
-
-  # allow building against against db5.3
-  patch -Np1 -d $pkgbase-$pkgver -i ../$pkgbase-3.8.4-db53.patch
 }
 
 build() {
@@ -128,7 +122,7 @@ package_postfix() {
   local _files_dir="$pkgdir/etc/$pkgbase/$pkgbase-files.d"
 
   depends+=(
-    db5.3
+    db
     icu libicuuc.so
     libnsl libnsl.so
     libsasl libsasl2.so

postfix-3.8.4-db53.patch

-diff --git a/makedefs b/makedefs
-index 005e4b3..a58bd08 100644
---- a/makedefs
-+++ b/makedefs
-@@ -555,21 +555,8 @@ case "$SYSTEM.$RELEASE" in
- 		case "$CCARGS" in
- 		 *-DNO_DB*) ;;
- 		 *-DHAS_DB*) ;;
--		 *) if [ -f /usr/include/db.h ]
--		    then
--			: we are all set
--		    elif [ -f /usr/include/db/db.h ]
--		    then
--			CCARGS="$CCARGS -I/usr/include/db"
--		    else
--			# No, we're not going to try db1 db2 db3 etc.
--			# On a properly installed system, Postfix builds
--			# by including <db.h> and by linking with -ldb
--			echo "No <db.h> include file found." 1>&2
--			echo "Install the appropriate db*-devel package first." 1>&2
--			exit 1
--		    fi
--		    SYSLIBS="-ldb"
-+		 *) CCARGS="$CCARGS -I/usr/include/db5.3"
-+		    SYSLIBS="-ldb5.3"
- 		    ;;
- 		esac
- 		for name in nsl resolv $GDBM_LIBS