Fix build with older openEXR versions

Dynamic exception specification is not allowed in c++-17. The enforcement needs
to be relaxed for the kimg_exr plugin when using openEXR versions older than 2.3.0.

(cherry picked from commit 3266a9c466)

CMakeLists.txt

@@ -2,10 +2,8 @@ cmake_minimum_required(VERSION 3.16)
 
 project(KImageFormats)
 
-set (CMAKE_CXX_STANDARD 14)
-
 include(FeatureSummary)
-find_package(ECM 5.83.0  NO_MODULE)
+find_package(ECM 5.84.0  NO_MODULE)
 set_package_properties(ECM PROPERTIES TYPE REQUIRED DESCRIPTION "Extra CMake Modules." URL "https://commits.kde.org/extra-cmake-modules")
 feature_summary(WHAT REQUIRED_PACKAGES_NOT_FOUND FATAL_ON_MISSING_REQUIRED_PACKAGES)
 

src/imageformats/CMakeLists.txt

@@ -61,6 +61,11 @@ if(OpenEXR_FOUND)
     if(TARGET OpenEXR::OpenEXR)
         target_link_libraries(kimg_exr OpenEXR::OpenEXR)
     else()
+        if(OpenEXR_VERSION_STRING VERSION_LESS 2.3.0)
+            # Older OpenEXR versions use dynamic exception specifications, so
+            # cannot use C++17 with them
+            set_target_properties(kimg_exr PROPERTIES CXX_STANDARD 14)
+        endif()
         target_link_libraries(kimg_exr OpenEXR::IlmImf)
     endif()
     kde_target_enable_exceptions(kimg_exr PRIVATE)

src/imageformats/avif.cpp

@@ -97,6 +97,10 @@ bool QAVIFHandler::ensureDecoder()
 
     m_decoder = avifDecoderCreate();
 
+#if AVIF_VERSION >= 90100
+    m_decoder->strictFlags = AVIF_STRICT_DISABLED;
+#endif
+
     avifResult decodeResult;
 
     decodeResult = avifDecoderSetIOMemory(m_decoder, m_rawAvifData.data, m_rawAvifData.size);