Ports: Added checksums / signature files and other fixes

* Use ${version} instead of explicit version numbers in urls/filenames
* Move -L option to port script, as this is always good
* Fix some various other stuff

Ports/gcc/package.sh

@@ -3,23 +3,16 @@ port=gcc
 version=9.2.0
 useconfigure=true
 configopts="--target=i686-pc-serenity --with-sysroot=/ --with-build-sysroot=$SERENITY_ROOT/Root --with-newlib --enable-languages=c,c++ --disable-lto --disable-nls"
-files="https://ftp.gnu.org/gnu/gcc/gcc-9.2.0/gcc-9.2.0.tar.xz gcc-9.2.0.tar.xz"
+files="https://ftp.gnu.org/gnu/gcc/gcc-${version}/gcc-${version}.tar.xz gcc-${version}.tar.xz
+https://ftp.gnu.org/gnu/gcc/gcc-${version}/gcc-${version}.tar.xz.sig gcc-${version}.tar.xz.sig
+https://ftp.gnu.org/gnu/gnu-keyring.gpg gnu-keyring.gpg"
 makeopts="all-gcc all-target-libgcc all-target-libstdc++-v3 -j $(nproc)"
 installopts="DESTDIR=$SERENITY_ROOT/Root install-gcc install-target-libgcc install-target-libstdc++-v3"
 depends="binutils"
-
-fetch() {
-    read url filename <<< $(echo "$files")
-    if [ -f "$filename" ]; then
-        echo "$filename already exists"
-    else
-        run_nocd curl -O "$url" -o "$filename"
-    fi
-    run_nocd tar xf "$filename"
+auth_type="sig"
+auth_opts="--keyring ./gnu-keyring.gpg gcc-${version}.tar.xz.sig"
+post_fetch() {
     run contrib/download_prerequisites
-    for f in patches/*; do
-        run patch -p1 < "$f"
-    done
 }
 build() {
     run make $makeopts