main/mksh: install mksh binary to /bin

fixes #4292

main/mksh/APKBUILD

@@ -2,7 +2,7 @@
 pkgname=mksh
 pkgver=51
 _pkgver=R$pkgver
-pkgrel=0
+pkgrel=1
 pkgdesc="MirBSD KSH Shell"
 url="http://mirbsd.de/mksh"
 arch="all"
@@ -10,7 +10,7 @@ license="BSD"
 depends=""
 depends_dev=""
 makedepends=""
-install="mksh.post-install mksh.post-upgrade mksh.pre-deinstall"
+install="$pkgname.post-install $pkgname.post-upgrade $pkgname.pre-deinstall"
 subpackages="$pkgname-doc"
 source="https://www.mirbsd.org/MirOS/dist/mir/mksh/$pkgname-$_pkgver.tgz"
 
@@ -22,9 +22,9 @@ build() {
 
 package() {
 	cd "$_builddir"
-	install -D -m 755 mksh "$pkgdir"/usr/bin/mksh
-	install -D -m 644 mksh.1 "$pkgdir"/usr/share/man/man1/mksh.1
-	install -D -m 644 dot.mkshrc "$pkgdir"/usr/share/doc/mksh/dot.mkshrc
+	install -Dm755 mksh "$pkgdir"/bin/mksh
+	install -Dm644 mksh.1 "$pkgdir"/usr/share/man/man1/mksh.1
+	install -Dm644 dot.mkshrc "$pkgdir"/usr/share/doc/mksh/dot.mkshrc
 }
 
 md5sums="8e522475da795c60f35a6f8035481baf  mksh-R51.tgz"

main/mksh/mksh.post-install

 #!/bin/sh
-add-shell '/usr/bin/mksh'
+add-shell '/bin/mksh'
 exit 0

main/mksh/mksh.pre-deinstall

 #!/bin/sh
-remove-shell '/usr/bin/mksh'
+remove-shell '/bin/mksh'
 exit 0