vcpkg/ports/libpng/fix-msa-support-for-mips.patch

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 3857b82..4c68989 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -221,8 +221,8 @@ endif()
 
 # Set definitions and sources for MIPS.
 if(TARGET_ARCH MATCHES "^(mipsel|mips64el)")
-  set(PNG_MIPS_MSA_POSSIBLE_VALUES on off)
-  set(PNG_MIPS_MSA "on"
+  set(PNG_MIPS_MSA_POSSIBLE_VALUES on off check)
+  set(PNG_MIPS_MSA "check"
       CACHE STRING "Enable MIPS_MSA optimizations: on|off; on is default")
   set_property(CACHE PNG_MIPS_MSA
                PROPERTY STRINGS ${PNG_MIPS_MSA_POSSIBLE_VALUES})
@@ -254,6 +254,12 @@ if(TARGET_ARCH MATCHES "^(mipsel|mips64el)")
         mips/filter_msa_intrinsics.c)
     add_definitions(-DPNG_MIPS_MSA_OPT=2)
     add_definitions(-DPNG_MIPS_MMI_OPT=0)
+  elseif(PNG_MIPS_MSA STREQUAL "check")
+    set(libpng_mips_sources
+        mips/mips_init.c
+        mips/filter_msa_intrinsics.c)
+    add_definitions(-DPNG_MIPS_MSA_CHECK_SUPPORTED)
+    add_definitions(-DPNG_MIPS_MMI_CHECK_SUPPORTED)
   elseif(PNG_MIPS_MMI STREQUAL "on")
     set(libpng_mips_sources
         mips/mips_init.c