fdupes: fix musl build

srcpkgs/fdupes/template

@@ -1,7 +1,7 @@
 # Template file for 'fdupes'
 pkgname=fdupes
 version=1.51
-revision=4
+revision=5
 distfiles="https://github.com/adrianlopezroche/fdupes/archive/$pkgname-$version.tar.gz"
 checksum=761e16d4ecfef7302c62fe7ef1e181cd34f5c6ce5377dcad96e3ed44fb364986
 maintainer="Steven R <dev@styez.com>"
@@ -10,6 +10,12 @@ license="MIT"
 short_desc="Identifying or deleting duplicate files residing within specified directories"
 wrksrc="$pkgname-$pkgname-$version"
 
+post_extract() {
+	# can't assign to stdin on musl
+	sed -i 's/stdin = freopen/FILE *tty = freopen/' -i fdupes.c
+	sed -i 's/deletefiles(files, 1, stdin);/deletefiles(files, 1, tty);/' -i fdupes.c
+}
+
 do_build() {
     make CC="$CC"
 }