gnu: meson: Update to 0.46.0.

* gnu/packages/build-tools.scm (meson): Update to 0.46.0.
* gnu/packages/patches/meson-for-build-rpath.patch: Adapt.

gnu/packages/build-tools.scm

@@ -98,7 +98,7 @@ generate such a compilation database.")
 (define-public meson
   (package
     (name "meson")
-    (version "0.45.1")
+    (version "0.46.0")
     (source (origin
               (method url-fetch)
               (uri (string-append "https://github.com/mesonbuild/meson/"
@@ -106,7 +106,7 @@ generate such a compilation database.")
                                   version ".tar.gz"))
               (sha256
                (base32
-                "1yqa4337nb8w92bvr91rsxmn0xkf7pmdybq9ljvnqmdvn7dv02sd"))))
+                "1w6bm43gy2swk3hmbarm0iv8m8yd8xm5jczsvfn8z2im3aq93pxp"))))
     (build-system python-build-system)
     (arguments
      `(;; FIXME: Tests require many additional inputs, a fix for the RUNPATH