[teagba] Fix type conversions

deps/teagba/src/CMakeLists.txt

@@ -10,6 +10,11 @@ add_library(
 		gfx.cpp
 )
 
+if(NOT MSVC)
+	target_compile_options(TeaGBA PRIVATE -Wsign-conversion)
+	target_compile_options(TeaGBA PRIVATE -Wconversion)
+endif()
+
 target_include_directories(
 	TeaGBA PUBLIC
 		../include
@@ -26,4 +31,4 @@ install(
 	DESTINATION
 		LIBRARY DESTINATION lib
 		ARCHIVE DESTINATION lib
-)
+)