windows: disable -fdata-sections

This causes all data to be emitted as .data$*. This breaks fzero-initialized-in-bss,
because linker puts stuff in .data even when it's all-zero and should end up in .bss.

libraries/config/os/windows/os.mk

@@ -1,5 +1,5 @@
 export ATMOSPHERE_DEFINES  += -DATMOSPHERE_OS_WINDOWS
-export ATMOSPHERE_SETTINGS += -fno-omit-frame-pointer
+export ATMOSPHERE_SETTINGS += -fno-omit-frame-pointer -fno-data-sections
 export ATMOSPHERE_CFLAGS   +=
 export ATMOSPHERE_CXXFLAGS +=
 export ATMOSPHERE_ASFLAGS  +=