Replace `TRUE/FALSE` with `IS_TRUE/IS_FALSE` on macros#1

pafuent wants to merge 1 commit intosamcragg:mastersamcragg/cpp_mock:masterfrom

pafuent:fixing_when_mingw_compiler_is_usedpafuent/cpp_mock:fixing_when_mingw_compiler_is_usedCopy head branch name to clipboard