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Fix cmake cpu detection.
  - NoTag <notag@maneto.fr>

--- libjpeg-turbo-2.1.4/CMakeLists.txt.vanilla	2023-04-24 17:09:08.517758745 +0200
+++ libjpeg-turbo-2.1.4/CMakeLists.txt	2023-04-24 17:09:45.508756808 +0200
@@ -55,6 +55,9 @@
 
 include(cmakescripts/PackageInfo.cmake)
 
+# allow us to override the arch with a flag because it complains on auto-detect
+option(CMAKE_SYSTEM_PROCESSOR "Cpu target architecture override" "foobar")
+
 # Detect CPU type and whether we're building 64-bit or 32-bit code
 math(EXPR BITS "${CMAKE_SIZEOF_VOID_P} * 8")
 string(TOLOWER ${CMAKE_SYSTEM_PROCESSOR} CMAKE_SYSTEM_PROCESSOR_LC)