Deb: Match official Debian package libmariadb-dev-compat

Using this package any source that expects MySQL Client libraries should
build without changes. Sources that expect MariaDB Connector C should
build using only libmariadb-dev.

Current MariaDB Connector/C does not build quite identically in
this source tree compared to how it build in Debian official.
The remaining differences are tracked in MDEV-14921.

debian/control

@@ -112,22 +112,44 @@ Depends: libmariadb3 (= ${binary:Version}),
          zlib1g-dev,
          ${misc:Depends},
          ${shlibs:Depends}
-Breaks: libmariadbclient-dev, libmysqlclient-dev
+Breaks: libmariadbclient-dev
-Replaces: libmariadbclient-dev, libmysqlclient-dev
+Replaces: libmariadbclient-dev
-Conflicts: libmariadbclient16-dev,
+Conflicts: libmariadbclient16-dev
-           libmysqlclient10-dev,
+Provides: libmariadbclient-dev
-           libmysqlclient12-dev,
-           libmysqlclient14-dev,
-           libmysqlclient15-dev,
-           libmysqlclient16-dev
-Provides: libmariadbclient-dev, libmariadbclient-dev-compat, libmysqlclient-dev
 Description: MariaDB database development files
  MariaDB is a fast, stable and true multi-user, multi-threaded SQL database
  server. SQL (Structured Query Language) is the most popular database query
  language in the world. The main goals of MariaDB are speed, robustness and
  ease of use.
  .
- This package includes development libraries and header files.
+ This package includes development libraries and header files. To allow sources
+ expecting the MariaDB Connector/C to build. Sources that expect the MySQL
+ Client libraries should use files from the libmariadb-dev-compat package.
+
+Package: libmariadb-dev-compat
+Architecture: any
+Multi-Arch: same
+Section: libdevel
+Priority: extra
+Depends: libmariadb-dev (= ${binary:Version}), ${misc:Depends}
+Conflicts: libmariadb-client-lgpl-dev-compat,
+           libmariadbclient-dev-compat,
+           libmysqlclient-dev,
+           libmysqlclient10-dev,
+           libmysqlclient12-dev,
+           libmysqlclient14-dev,
+           libmysqlclient15-dev,
+           libmysqlclient16-dev
+Provides: libmariadbclient-dev-compat, libmariadb-client-lgpl-dev-compat, libmysqlclient-dev
+Replaces: libmariadbclient-dev-compat, libmariadb-client-lgpl-dev-compat, libmysqlclient-dev
+Description: MariaDB Connector/C, compatibility symlinks
+ MariaDB is a fast, stable and true multi-user, multi-threaded SQL database
+ server. SQL (Structured Query Language) is the most popular database query
+ language in the world. The main goals of MariaDB are speed, robustness and
+ ease of use.
+ .
+ This package includes compatibility symlinks to allow sources expecting the
+ MySQL client libraries to be built against MariaDB Connector/C.
 
 Package: libmariadbd19
 Architecture: any

debian/libmariadb-dev-compat.install

@@ -0,0 +1,4 @@
+usr/lib/*/libmysqlclient.a
+usr/lib/*/libmysqlclient.so
+usr/lib/*/libmysqlclient_r.a
+usr/lib/*/libmysqlclient_r.so

debian/libmariadb-dev-compat.links

@@ -0,0 +1,2 @@
+usr/bin/mariadb_config usr/bin/mysql_config
+usr/share/pkgconfig/mariadb.pc usr/share/pkgconfig/mysqlclient.pc

debian/libmariadb-dev.install

@@ -1,8 +1,6 @@
-usr/bin/mysql_config
+usr/bin/mariadb_config
 usr/include/mysql
-usr/include/mariadb
 usr/lib/*/libmariadb.so
-usr/lib/*/libmysqlclient.so
 usr/lib/*/libmariadbclient.so
 usr/lib/*/libmariadbclient.a
 usr/lib/*/libmysqlservices.a

debian/libmariadb-dev.links

@@ -0,0 +1,2 @@
+usr/include/mysql usr/include/mariadb
+usr/share/man/man1/mysql_config.1.gz usr/share/man/man1/mariadb_config.1.gz

debian/libmariadbd-dev.install

@@ -1,3 +1,2 @@
-usr/bin/mariadb_config
 usr/lib/*/libmysqld.a
 usr/lib/*/libmysqld.so