gnu: meson-for-build: Remove package.

The meson-for-build package doesn't carry any special patch anymore; it
appears to be obsolete.

* gnu/packages/build-tools.scm (meson-for-build): Remove variable.
* guix/build-system/meson.scm (default-meson): Use meson.
* doc/guix.texi (Build Systems): Update doc.

doc/guix.texi

@@ -7969,9 +7969,7 @@ implements the build procedure for packages that use
 
 It adds both Meson and @uref{https://ninja-build.org/, Ninja} to the set
 of inputs, and they can be changed with the parameters @code{#:meson}
-and @code{#:ninja} if needed.  The default Meson is
-@code{meson-for-build}, which is special because it doesn't clear the
-@code{RUNPATH} of binaries and libraries when they are installed.
+and @code{#:ninja} if needed.
 
 This build system is an extension of @code{gnu-build-system}, but with the
 following phases changed to some specific for Meson:
@@ -8002,11 +8000,11 @@ Apart from that, the build system also adds the following phases:
 
 @item fix-runpath
 This phase ensures that all binaries can find the libraries they need.
-It searches for required libraries in subdirectories of the package being
-built, and adds those to @code{RUNPATH} where needed.  It also removes
-references to libraries left over from the build phase by
-@code{meson-for-build}, such as test dependencies, that aren't actually
-required for the program to run.
+It searches for required libraries in subdirectories of the package
+being built, and adds those to @code{RUNPATH} where needed.  It also
+removes references to libraries left over from the build phase by
+@code{meson}, such as test dependencies, that aren't actually required
+for the program to run.
 
 @item glib-or-gtk-wrap
 This phase is the phase provided by @code{glib-or-gtk-build-system}, and it

gnu/packages/build-tools.scm

@@ -263,16 +263,6 @@ resembles Python.")
                (base32
                 "19cjy24mfaswxyvqmns6rd7hx05ybqb663zlgklspfr8l4jjmvbb"))))))
 
-(define-public meson-for-build
-  (package
-    (inherit meson)
-    (name "meson-for-build")
-    (source (origin
-              (inherit (package-source meson))))
-
-    ;; People should probably install "meson", not "meson-for-build".
-    (properties `((hidden? . #t)))))
-
 (define-public premake4
   (package
     (name "premake")

guix/build-system/meson.scm

@@ -55,7 +55,7 @@
   "Return the default meson package."
   ;; Lazily resolve the binding to avoid a circular dependency.
   (let ((module (resolve-interface '(gnu packages build-tools))))
-    (module-ref module 'meson-for-build)))
+    (module-ref module 'meson)))
 
 (define* (lower name
                 #:key source inputs native-inputs outputs system target