ext-toolchain-wrapper: fix typo on s/BR2_FPU/BR_FPU/

Signed-off-by: Spenser Gilliland <spenser@gillilanding.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

toolchain/toolchain-external/ext-toolchain-wrapper.c

@@ -41,7 +41,7 @@ static char *predef_args[] = {
 #ifdef BR_FLOAT_ABI
 	"-mfloat-abi=" BR_FLOAT_ABI,
 #endif
-#ifdef BR2_FPU
+#ifdef BR_FPU
 	"-mfpu=" BR_FPU,
 #endif
 #ifdef BR_SOFTFLOAT