Fix build with clang-{10,11} (#492)

Newer clang versions report several "Wimplicit-int-float-conversion"
warnings. This commit silences this warning completely.

Co-authored-by: Vojtech Havel <[email protected]>

Author: vhavel

src/CMakeLists.txt

@@ -71,6 +71,7 @@ endif()
 
 if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wconversion -Wno-sign-conversion -Wno-shorten-64-to-32 -Wno-undefined-var-template -Werror")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-implicit-int-float-conversion")
 elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU") # To many superfluous warnings generated with GCC when using -Wconversion (see: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=40752)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror")
 endif()