appveyor: try vs2008 x64 with VS2013 image

appveyor.sh

@@ -50,12 +50,12 @@ if [ "${BUILD_SYSTEM}" = 'CMake' ]; then
   for _chkprefill in '' ${CHKPREFILL:-}; do
     options=''
     [ "${_chkprefill}" = '_chkprefill' ] && options+=' -D_CURL_PREFILL=OFF'
-    [[ "${TARGET}" = *'ARM64'* ]] && SKIP_RUN='ARM64 architecture'
+    [[ "${TARGET:-}" = *'ARM64'* ]] && SKIP_RUN='ARM64 architecture'
     [ -n "${TOOLSET:-}" ] && options+=" -T ${TOOLSET}"
     [ "${OPENSSL}" = 'ON' ] && options+=" -DOPENSSL_ROOT_DIR=${openssl_root_win}"
     [ -n "${CURLDEBUG:-}" ] && options+=" -DENABLE_CURLDEBUG=${CURLDEBUG}"
     # shellcheck disable=SC2086
-    cmake -B "_bld${_chkprefill}" -G "${PRJ_GEN}" ${TARGET} \
+    cmake -B "_bld${_chkprefill}" -G "${PRJ_GEN}" ${TARGET:-} \
       -DCMAKE_VS_GLOBALS=TrackFileAccess=false \
       -DCMAKE_UNITY_BUILD="${UNITY}" -DCURL_TEST_BUNDLES=ON \
       -DCURL_WERROR=ON \
@@ -77,7 +77,7 @@ if [ "${BUILD_SYSTEM}" = 'CMake' ]; then
   echo 'curl_config.h'; grep -F '#define' _bld/lib/curl_config.h | sort || true
   # shellcheck disable=SC2086
   if ! cmake --build _bld --config "${PRJ_CFG}" --parallel 2 -- ${BUILD_OPT:-}; then
-    if [ "${PRJ_GEN}" = 'Visual Studio 9 2008' ]; then
+    if [[ "${PRJ_GEN}" = 'Visual Studio 9 2008'* ]]; then
       find . -name BuildLog.htm -exec dos2unix '{}' +
       find . -name BuildLog.htm -exec cat '{}' +
     fi

appveyor.yml

@@ -70,6 +70,14 @@ environment:
       SCHANNEL: 'ON'
       SHARED: 'ON'
       EXAMPLES: 'OFF'
+    - job_name: 'CMake, VS2008, Debug, x64, OpenSSL 1.0.2 + Schannel, Shared, Build-tests & examples'
+      APPVEYOR_BUILD_WORKER_IMAGE: 'Visual Studio 2013'
+      PRJ_GEN: 'Visual Studio 9 2008 Win64'
+      PRJ_CFG: Debug
+      OPENSSL: 'ON'
+      SCHANNEL: 'ON'
+      SHARED: 'ON'
+      EXAMPLES: 'OFF'
     - job_name: 'CMake, VS2010, Debug, x64, Schannel, Shared, Build-tests & examples'
       APPVEYOR_BUILD_WORKER_IMAGE: 'Visual Studio 2015'
       PRJ_GEN: 'Visual Studio 10 2010'