sync code with last improvements from OpenBSD

lib/mesa/.gitlab-ci/container/container_pre_build.sh

@@ -0,0 +1,46 @@
+#!/bin/sh
+
+if test -f /etc/debian_version; then
+    CCACHE_PATH=/usr/lib/ccache
+else
+    CCACHE_PATH=/usr/lib64/ccache
+fi
+
+# Common setup among container builds before we get to building code.
+
+export CCACHE_COMPILERCHECK=content
+export CCACHE_COMPRESS=true
+export CCACHE_DIR=/cache/$CI_PROJECT_NAME/ccache
+export PATH=$CCACHE_PATH:$PATH
+
+# CMake ignores $PATH, so we have to force CC/GCC to the ccache versions.
+export CC="${CCACHE_PATH}/gcc"
+export CXX="${CCACHE_PATH}/g++"
+
+# When not using the mold linker (e.g. unsupported architecture), force
+# linkers to gold, since it's so much faster for building.  We can't use
+# lld because we're on old debian and it's buggy.  ming fails meson builds
+# with it with "meson.build:21:0: ERROR: Unable to determine dynamic linker"
+find /usr/bin -name \*-ld -o -name ld | \
+    grep -v mingw | \
+    xargs -n 1 -I '{}' ln -sf '{}.gold' '{}'
+
+ccache --show-stats
+
+# Make a wrapper script for ninja to always include the -j flags
+{
+    echo '#!/bin/sh -x'
+    # shellcheck disable=SC2016
+    echo '/usr/bin/ninja -j${FDO_CI_CONCURRENT:-4} "$@"'
+} > /usr/local/bin/ninja
+chmod +x /usr/local/bin/ninja
+
+# Set MAKEFLAGS so that all make invocations in container builds include the
+# flags (doesn't apply to non-container builds, but we don't run make there)
+export MAKEFLAGS="-j${FDO_CI_CONCURRENT:-4}"
+
+# make wget to try more than once, when download fails or timeout
+echo -e "retry_connrefused = on\n" \
+        "read_timeout = 300\n" \
+        "tries = 4\n" \
+        "wait_retry = 32" >> /etc/wgetrc