[notformerge] Make coreboot's buildgcc use a gzip'd gcc tarball

Decompressing GCC takes a significant amount of time. Gzip can be
decompressed using multiple threads (buildgcc will use `pigz` if
available), so this just trades decompression speed and download
time (download should only occur once anyway).

Signed-off-by: David Hendricks <david.hendricks@gmail.com>

Author: dhendrix

examples/qemu/patches/coreboot-qemu-amd64-buildgcc-Use-GCC-gz-file-instead-of-xz.patch

@@ -0,0 +1,23 @@
+diff --git a/util/crossgcc/buildgcc b/util/crossgcc/buildgcc
+index 6c1a7a59dc..54ea7f0d2b 100755
+--- a/util/crossgcc/buildgcc
++++ b/util/crossgcc/buildgcc
+@@ -51,7 +51,7 @@ NASM_VERSION=2.15.05
+ GMP_ARCHIVE="https://ftpmirror.gnu.org/gmp/gmp-${GMP_VERSION}.tar.xz"
+ MPFR_ARCHIVE="https://ftpmirror.gnu.org/mpfr/mpfr-${MPFR_VERSION}.tar.xz"
+ MPC_ARCHIVE="https://ftpmirror.gnu.org/mpc/mpc-${MPC_VERSION}.tar.gz"
+-GCC_ARCHIVE="https://ftpmirror.gnu.org/gcc/gcc-${GCC_VERSION}/gcc-${GCC_VERSION}.tar.xz"
++GCC_ARCHIVE="https://ftpmirror.gnu.org/gcc/gcc-${GCC_VERSION}/gcc-${GCC_VERSION}.tar.gz"
+ BINUTILS_ARCHIVE="https://ftpmirror.gnu.org/binutils/binutils-${BINUTILS_VERSION}.tar.xz"
+ IASL_ARCHIVE="https://acpica.org/sites/acpica/files/acpica-unix2-${IASL_VERSION}.tar.gz"
+ # CLANG toolchain archive locations
+diff --git a/util/crossgcc/sum/gcc-11.2.0.tar.gz.cksum b/util/crossgcc/sum/gcc-11.2.0.tar.gz.cksum
+new file mode 100644
+index 0000000000..0ce44f44ac
+--- /dev/null
++++ b/util/crossgcc/sum/gcc-11.2.0.tar.gz.cksum
+@@ -0,0 +1 @@
++4d631f343fc3bca2097dbb115f3cb42309a09e22  tarballs/gcc-11.2.0.tar.gz
+-- 
+2.32.0
+