PC-BSD/trueos fed52a6stand defs.mk, stand/i386/loader Makefile

MFC r352032: loader: --gc-sections needs sections to work with

--gc-sections is not really useful unless we generate sections with
-ffunction-sections -fdata-sections

While there, i386/loader would win from --gc-sections too.
DeltaFile
+1-1stand/i386/loader/Makefile
+1-0stand/defs.mk
+2-12 files

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