SDL: ci: disable parallel building for ps2

From abfc2a01ca8224fbfe6f346a471bb975e217c79e Mon Sep 17 00:00:00 2001
From: Anonymous Maarten <[EMAIL REDACTED]>
Date: Fri, 17 Mar 2023 17:51:43 +0100
Subject: [PATCH] ci: disable parallel building for ps2

The ps2 builds were flaky.

https://github.com/ps2dev/ps2dev/issues/67
---
 .github/workflows/ps2.yml | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/ps2.yml b/.github/workflows/ps2.yml
index 2c6895e515d4..f1c349b5a86b 100644
--- a/.github/workflows/ps2.yml
+++ b/.github/workflows/ps2.yml
@@ -36,7 +36,7 @@ jobs:
           -DCMAKE_INSTALL_PREFIX=cmake_prefix \
           -DCMAKE_BUILD_TYPE=Release
     - name: Build (CMake)
-      run: cmake --build build --config Release --verbose --parallel
+      run: cmake --build build --config Release --verbose -- -j 1
     - name: Install (CMake)
       run: |
         set -eu
@@ -45,7 +45,7 @@ jobs:
         ( cd cmake_prefix; find ) | LC_ALL=C sort -u
     - name: Package (CPack)
       run: |
-        cmake --build build/ --config Release --target package
+        cmake --build build/ --config Release --target package -- -j 1
 
     - name: Verify CMake configuration files
       run: |
@@ -55,7 +55,7 @@ jobs:
           -DTEST_SHARED=FALSE \
           -DCMAKE_PREFIX_PATH=${{ env.SDL3_DIR }} \
           -DCMAKE_BUILD_TYPE=Release
-        cmake --build cmake_config_build --verbose
+        cmake --build cmake_config_build --verbose -- -j 1
     - name: Verify sdl3.pc
       run: |
         export CC=mips64r5900el-ps2-elf-gcc