clang 10 compile issue

[gregoranders]

Describe the bug

Clang 10 compile issue.
[ 32%] Building CXX object src/CMakeFiles/libcataclysm-tiles.dir/loading_ui.cpp.o /home/developer/GitHub/gregoranders/Cataclysm-DDA.source/src/lightmap.cpp:1209:49: error: implicit conversion from 'int' to 'float' changes value from 1056478197 to 1056478208 [-Werror,-Wimplicit-int-float-conversion] u.i = static_cast<long long>( 6051102 * x + 1056478197 ); ~ ^~~~~~~~~~ /home/developer/GitHub/gregoranders/Cataclysm-DDA.source/src/lightmap.cpp:1210:35: error: implicit conversion from 'int' to 'float' changes value from 1056478197 to 1056478208 [-Werror,-Wimplicit-int-float-conversion] v.i = static_cast<long long>( 1056478197 - 6051102 * x ); ^~~~~~~~~~ ~ 2 errors generated. make[2]: *** [src/CMakeFiles/libcataclysm-tiles.dir/build.make:1549: src/CMakeFiles/libcataclysm-tiles.dir/lightmap.cpp.o] Error 1 make[2]: *** Waiting for unfinished jobs....

Steps To Reproduce

compile with clang 10

Versions and configuration

Commit: f8ba267

clang version 10.0.0 (/var/tmp/portage/sys-devel/clang-10.0.0.9999/work/x/y/clang)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/lib/llvm/10/bin