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5l: remove -f flag and add -F flag to disable VFP code generation

almost nobody uses FPA anymore, so make VFP the default but
provide -F flag to disable it.

--- a/sys/man/1/2l

+++ b/sys/man/1/2l

@@ -102,8 +102,8 @@

 .L _traceout

 at function exits.

 .TP

-.B -f

-(ARM only) Generate VFP hardware floating point instructions.

+.B -F

+(ARM only) Don't generate VFP hardware floating point instructions.

 .TP

 .B -s

 Strip the symbol tables from the output file.

--- a/sys/src/cmd/5l/span.c

+++ b/sys/src/cmd/5l/span.c

@@ -660,7 +660,7 @@

 	int i, n, r;

 	armv4 = !debug['h'];

-	vfp = debug['f'];

+	vfp = !debug['F'];

 	for(i=0; i<C_GOK; i++)

 		for(n=0; n<C_GOK; n++)

 			xcmp[i][n] = cmp(n, i);