gnu: Remove redundant MariaDB inputs.

For well-behaved build systems, including the "dev" output suffices.

* gnu/packages/bioinformatics.scm (kentutils)[inputs]: Remove MARIADB:LIB.
* gnu/packages/cran.scm (r-rmysql)[inputs]: Likewise.
* gnu/packages/databases.scm (python-mysqlclient, soci)[inputs]: Likewise.
* gnu/packages/qt.scm (qt-4, qtbase): Likewise.
* gnu/packages/ruby.scm (ruby-mysql2)[inputs]: Likewise.

gnu/packages/bioinformatics.scm

@@ -11154,7 +11154,6 @@ (define-public kentutils
        ("tcsh" ,tcsh)
        ("perl" ,perl)
        ("libpng" ,libpng)
-       ("mariadb" ,mariadb "lib")
        ("mariadb-dev" ,mariadb "dev")
        ("openssl" ,openssl-1.0)))
     (home-page "https://genome.cse.ucsc.edu/index.html")

gnu/packages/cran.scm

@@ -3327,8 +3327,7 @@ (define-public r-rmysql
     (properties `((upstream-name . "RMySQL")))
     (build-system r-build-system)
     (inputs
-     `(("mariadb" ,mariadb "lib")
-       ("mariadb-dev" ,mariadb "dev")
+     `(("mariadb-dev" ,mariadb "dev")
        ("zlib" ,zlib)))
     (propagated-inputs
      `(("r-dbi" ,r-dbi)))

gnu/packages/databases.scm

@@ -2990,8 +2990,7 @@ (define-public python-mysqlclient
     (build-system python-build-system)
     (arguments '(#:tests? #f))          ;XXX: requires a live database
     (inputs
-     `(("mysql" ,mariadb "lib")
-       ("mysql-dev" ,mariadb "dev")))
+     `(("mysql-dev" ,mariadb "dev")))
     (home-page "https://github.com/PyMySQL/mysqlclient-python")
     (synopsis "MySQLdb is an interface to the popular MySQL database server for Python")
     (description "MySQLdb is an interface to the popular MySQL database server
@@ -3672,8 +3671,7 @@ (define-public soci
        ("sqlite" ,sqlite)
        ("odbc" ,unixodbc)
        ("boost" ,boost)
-       ("mariadb:dev" ,mariadb "dev")
-       ("mariadb:lib" ,mariadb "lib")))
+       ("mariadb:dev" ,mariadb "dev")))
     (arguments
      `(#:tests? #f ; Tests may require running database management systems.
        #:phases

gnu/packages/kodi.scm

@@ -435,7 +435,7 @@ (define-public kodi
        ("libxrender" ,libxrender)
        ("libxslt" ,libxslt)
        ("lzo" ,lzo)
-       ("mariadb" ,mariadb "lib")
+       ("mariadb-dev" ,mariadb "lib")
        ("mariadb-dev" ,mariadb "dev")
        ("openssl" ,openssl)
        ("pcre" ,pcre)

gnu/packages/qt.scm

@@ -195,7 +195,6 @@ (define-public qt-4
        ("libxslt" ,libxslt)
        ("libxtst" ,libxtst)
        ("mtdev" ,mtdev)
-       ("mariadb" ,mariadb "lib")
        ("mariadb-dev" ,mariadb "dev")
        ("nss" ,nss)
        ("postgresql" ,postgresql)
@@ -406,7 +405,6 @@ (define-public qtbase
        ("libxslt" ,libxslt)
        ("libxtst" ,libxtst)
        ("mtdev" ,mtdev)
-       ("mariadb" ,mariadb "lib")
        ("mariadb-dev" ,mariadb "dev")
        ("nss" ,nss)
        ("openssl" ,openssl)

gnu/packages/ruby.scm

@@ -3795,8 +3795,7 @@ (define-public ruby-mysql2
                (invoke "rspec"))
              #t)))))
     (inputs
-     `(("mariadb" ,mariadb "lib")
-       ("mariadb-dev" ,mariadb "dev")
+     `(("mariadb-dev" ,mariadb "dev")
        ("zlib" ,zlib)))
     (native-inputs
      `(("ruby-rspec" ,ruby-rspec)