testing/ocaml-easy-format: rebuild against new ocaml

Closes: GH-8153

testing/ocaml-easy-format/APKBUILD

@@ -3,7 +3,7 @@
 pkgname=ocaml-easy-format
 _pkgname=easy-format
 pkgver=1.3.1
-pkgrel=1
+pkgrel=2
 pkgdesc="Pretty-printing library for OCaml"
 url="https://mjambon.github.io/mjambon2016/easy-format.html"
 arch="all !x86 !armhf !armv7 !s390x"  # limited by ocaml aport
@@ -16,18 +16,14 @@ source="$pkgname-$pkgver.tar.gz::https://github.com/mjambon/$_pkgname/archive/v$
 builddir="$srcdir/$_pkgname-$pkgver"
 
 build() {
-	cd "$builddir"
 	jbuilder build @install
 }
 
 check() {
-	cd "$builddir"
 	jbuilder runtest
 }
 
 package() {
-	cd "$builddir"
-
 	mkdir -p "$pkgdir"/usr/lib/ocaml
 	jbuilder install \
 		--destdir="$pkgdir"/usr \