Update mesa to version 20.0.8 (bug #58689). * src/mesa.mk: Update version and checksum. Add build-meson to dependecies. Update build rule to use meson and ninja as the build tools. * src/mesa-1-meson.patch: Add new patch. * src/mesa-1-fixes.patch: Remove old patch for the scons rule that is no longer needed. * dist-files.mk: Update file list. * src/build-mako.mk: Depend on and use python3. * src/build-markupsafe.mk: Depend on and use python3.

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Make sure exec_prefix is defined in wavpack.pc.

diff -ur a/wavpack.pc.in b/wavpack.pc.in
--- a/wavpack.pc.in	2013-09-29 23:30:14.000000000 +0200
+++ b/wavpack.pc.in	2013-11-17 18:31:35.351567596 +0100
@@ -1,4 +1,5 @@
 prefix=@prefix@
+exec_prefix=${prefix}
 libdir=@libdir@
 includedir=${prefix}/include