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ape/lib9: sync arm getfcr.s implementation

The arm assembler supports movw to handle
getfcr and setfcr now, no need to hack it
with macros; sync from plan9 libc.

--- a/sys/src/ape/lib/9/arm/getfcr.s

+++ b/sys/src/ape/lib/9/arm/getfcr.s

@@ -1,16 +1,21 @@

+/* for VFP */

+#define VMRS(fp, cpu) WORD $(0xeef00a10 | (fp)<<16 | (cpu)<<12) /* FP → arm */

+#define VMSR(cpu, fp) WORD $(0xeee00a10 | (fp)<<16 | (cpu)<<12) /* arm → FP */

-TEXT	setfcr(SB), $4

-	MOVW	R0, FPCR

+#define Fpscr 1

+

+TEXT	setfcr(SB), $0

+	VMSR(0, Fpscr)

 	RET

-TEXT	getfcr(SB), $4

-	MOVW	FPCR, R0

+TEXT	getfcr(SB), $0

+	VMRS(Fpscr, 0)

 	RET

 TEXT	getfsr(SB), $0

-	MOVW	FPSR, R0

+	VMSR(0, Fpscr)

 	RET

 TEXT	setfsr(SB), $0

-	MOVW	R0, FPSR

+	VMRS(Fpscr, 0)

 	RET