change download url

Author: AkashiSN

build-ffmpeg

@@ -239,7 +239,7 @@ fi
 ##
 
 if build "m4"; then
-	download "https://ftpmirror.gnu.org/m4/m4-1.4.18.tar.xz"
+	download "https://ftp.gnu.org/gnu/m4/m4-1.4.18.tar.xz"
 	# https://lists.gnu.org/archive/html/bug-m4/2018-08/msg00000.html
 	# No new version of M4 has been released, so a patch has been applied.
 	execute curl -sLJO https://github.com/easybuilders/easybuild-easyconfigs/raw/master/easybuild/easyconfigs/m/M4/M4-1.4.18_glibc_2.28.patch
@@ -251,23 +251,23 @@ if build "m4"; then
 fi
 
 if build "autoconf"; then
-	download "https://ftpmirror.gnu.org/autoconf/autoconf-2.69.tar.xz"
+	download "https://ftp.gnu.org/gnu/autoconf/autoconf-2.69.tar.xz"
 	execute ./configure --prefix="${WORKSPACE}"
 	execute make -j $MJOBS
 	execute make install
 	build_done "autoconf"
 fi
 
 if build "automake"; then
-	download "https://ftpmirror.gnu.org/automake/automake-1.16.tar.xz"
+	download "https://ftp.gnu.org/gnu/automake/automake-1.16.tar.xz"
 	execute ./configure --prefix="${WORKSPACE}"
 	execute make -j $MJOBS
 	execute make install
 	build_done "automake"
 fi
 
 if build "libtool"; then
-	download "https://ftpmirror.gnu.org/libtool/libtool-2.4.6.tar.xz"
+	download "https://ftp.gnu.org/gnu/libtool/libtool-2.4.6.tar.xz"
 	execute ./configure --prefix="${WORKSPACE}"  --disable-shared --enable-static
 	execute make -j $MJOBS
 	execute make install