Link libjpeg-turbo on iOS against prebuilt lib

This needs to be fixed at some point, see #99

3rdParty/CMakeLists.txt

@@ -22,7 +22,7 @@ add_subdirectory(rapidyaml)
 add_subdirectory(libarchive)
 add_subdirectory(boost)
 add_subdirectory(units)
-if (NOT IOS)
 add_subdirectory(libjpeg-turbo)
+if (NOT IOS)
     add_subdirectory(curl)
 endif()

3rdParty/libjpeg-turbo/CMakeLists.txt

@@ -31,6 +31,11 @@ endif ()
 
 
 function(LinkLibJpegTurbo TARGET)
+    if (IOS)
+        target_link_libraries(${TARGET} PRIVATE "/opt/libjpeg-turbo-ios/lib/libturbojpeg.a")
+        target_include_directories(${TARGET} PRIVATE "/opt/libjpeg-turbo-ios/include")
+        return()
+    endif ()
     if (libjpeg-turbo_BUILT)
         FindCmakeConfigDirs("${CMAKE_BINARY_DIR}/deps_ljt/INSTALL/" CMAKE_PREFIX_PATH)
     endif()