Fix #436: Clean apkbuilds (#692)

* Remove empty build() functions
* Remove obsolete '|| return 1' statements

main/libsparse/APKBUILD

@@ -1,6 +1,6 @@
 pkgname=libsparse
 pkgver="1.0.0"
-pkgrel=1
+pkgrel=2
 pkgdesc="Android Sparse library"
 url="https://android.googlesource.com"
 arch="all"
@@ -22,7 +22,7 @@ package() {
     cd "$srcdir"/android-simg2img-"$pkgver"
 
     for i in append2simg img2simg simg2img simg2simg simg_dump.py; do
-        install -D -m755 "$i" "$pkgdir"/usr/bin/"$i" || return 1
+        install -D -m755 "$i" "$pkgdir"/usr/bin/"$i"
     done
 }