zita-at1: fix resource location.

It install resources in /usr/share, but was built with
PREFIX=/usr/local/share. This commit passes PREFIX=/usr during build
time to fix that.

Also:

- Use vsed instead of sed
- Remove unnecessary sed for -march=native, issue now fixed in the
gnu-makefile style

Fixes #27002.

srcpkgs/zita-at1/template

@@ -1,9 +1,10 @@
 # Template file for 'zita-at1'
 pkgname=zita-at1
 version=0.6.2
-revision=1
+revision=2
 build_wrksrc=source
 build_style=gnu-makefile
+make_build_args="PREFIX=/usr"
 hostmakedepends="pkg-config"
 makedepends="clxclient-devel clthreads-devel zita-resampler-devel cairo-devel
  freetype-devel fftw-devel jack-devel libpng-devel libXft-devel libX11-devel"
@@ -15,7 +16,6 @@ distfiles="https://kokkinizita.linuxaudio.org/linuxaudio/downloads/${pkgname}-${
 checksum=19bb3ddc02b32d6ad15fdd928ee66c2e5bb5e4c7fe465c431e98c2fd83b1ae57
 
 pre_build() {
-	sed -i '/march=native/d' Makefile
 	# change pkgconf to pkg-config
-	sed -i 's/pkgconf/pkg-config/' Makefile
+	vsed -e 's/pkgconf/pkg-config/' -i Makefile
 }