Fix Build issue in Windows (VS Env)

[smohantty]

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[smohantty]

set of patches are added to make rlottie build on windows (with visual studio backend)
--> only meson backend is made to work on windows
to create VS solution file use below command.
meson builddir -Dwerror=false --backend vs2019

to use the ninja backend use below command
meson builddir -Dwerror=false

Things still dosen't work.
cmake backend still gives error for windows build.

image loader dosen't work if build as separate module.
To make image work pass -Dmodule=false to meson while configuring.