[CMake] Case-insensitive string compare

[Robert Dailey]

How can I perform a case-insensitive string comparison? I basically need to
do this:

set( file "Makefile" )
if( file STREQUAL "makefile" )
   ....
endif()

The above condition should PASS, since I want to ignore case, but as of
right now it seems STREQUAL is case-sensitive. I need to do this without
mutating either operand (i.e. i can't use string( TOLOWER ) )
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