Workaround Clang 20 float override warnings (#500)

Author: solidpixel

Source/UnitTest/cmake_core.cmake

@@ -59,6 +59,7 @@ target_compile_options(${ASTCENC_TEST}
         $<$<NOT:$<CXX_COMPILER_ID:MSVC>>:-Wno-c++98-compat-pedantic>
         $<$<NOT:$<CXX_COMPILER_ID:MSVC>>:-Wno-c++98-c++11-compat-pedantic>
         $<$<NOT:$<CXX_COMPILER_ID:MSVC>>:-Wno-float-equal>
+        $<$<NOT:$<CXX_COMPILER_ID:MSVC>>:-Wno-overriding-option>
 
         # Ignore things that the googletest build triggers
         $<$<NOT:$<CXX_COMPILER_ID:MSVC>>:-Wno-unknown-warning-option>

Source/cmake_core.cmake

@@ -176,6 +176,7 @@ macro(astcenc_set_properties ASTCENC_TARGET_NAME ASTCENC_IS_VENEER)
             $<${is_gnu_fe}:-Wno-float-equal>
             $<${is_gnu_fe}:-Wno-deprecated-declarations>
             $<${is_gnu_fe}:-Wno-atomic-implicit-seq-cst>
+            $<${is_clang}:-Wno-overriding-option>
 
             # Clang 10 also throws up warnings we need to investigate (ours)
             $<${is_gnu_fe}:-Wno-cast-align>