The libisomediafile target should not specify build-specific compiler options

[inkychris]

The hard-coding of compiler options conflict with options that might be required in parent projects. These should be moved to the configuration stage for testing in this project and/or guarded with an option to allow the parent projects to prevent them from being set if needed.

isobmff/IsoLib/libisomediafile/CMakeLists.txt

Lines 9 to 15 in 7eaf048

	if (MSVC)
	# warning level 4 and all warnings as errors
	add_compile_options(/W4 /WX)
	else()
	# lots of warnings and all warnings as errors
	add_compile_options(-Wall -Wextra -pedantic -Werror)
	endif()

isobmff/IsoLib/libisomediafile/CMakeLists.txt

Lines 266 to 277 in 7eaf048

	target_compile_options(
	${PROJECT_NAME}
	PRIVATE
	# GNU compiler
	$<$<C_COMPILER_ID:GNU>:-Wall -W -ansi -pedantic -Wno-long-long -Wmissing-prototypes>
	# Visual Studio run time library
	$<$<AND:$<C_COMPILER_ID:MSVC>,$<CONFIG:Debug>>:/MTd>
	$<$<AND:$<C_COMPILER_ID:MSVC>,$<NOT:$<CONFIG:Debug>>>:/MT>
	)