toolchain/gcc: Enable --with-float for powerpc

Commit 8d929f4b ("toolchain/gcc: Only enable --with-float when it makes
sense") restricted the --with-float use to only MIPS, ARM and SPARC,
while it seems that powerpc needs it as well.

Fixes the qemu_ppc_virtex_ml507_defconfig build.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

toolchain/gcc/gcc-uclibc-4.x.mk

@@ -66,7 +66,8 @@ endif
 # Determine soft-float options
 ifeq ($(BR2_SOFT_FLOAT),y)
 # only mips*-*-*, arm*-*-* and sparc*-*-* accept --with-float
-ifeq ($(BR2_arm)$(BR2_armeb)$(BR2_mips)$(BR2_mipsel)$(BR2_mips64)$(BR2_mips64el)$(BR2_sparc),y)
+# powerpc seems to be needing it as well
+ifeq ($(BR2_arm)$(BR2_armeb)$(BR2_mips)$(BR2_mipsel)$(BR2_mips64)$(BR2_mips64el)$(BR2_powerpc)$(BR2_sparc),y)
 SOFT_FLOAT_CONFIG_OPTION:=--with-float=soft
 endif
 ifeq ($(BR2_arm)$(BR2_armeb),y) # only set float-abi for arm