klibc.inc: lazy assign GCCPIE in case security_flags.inc was not included
klibc.inc: lazy assign GCCPIE in case security_flags.inc was not included

fix build error (GCCPIE is unset):

EXTRA_KLIBCAFLAGS=${SECURITY_CFLAGS} -Wa,--noexecstack
EXTRA_KLIBCLDFLAGS=${@-z relro -z now -pie if  else } -z noexecstack
| make: invalid option -- 'z'
| make: invalid option -- ' '

Signed-off-by: Andrea Adami <58a22b0beb8ec13ae546a060c8b4c576f22f6153@gmail.com>
Signed-off-by: Khem Raj <729d64b6f67515e258459a5f6d20ec88b2caf8df@gmail.com>

moto-timo/meta-openembedded,VCTLabs/meta-openembedded,VCTLabs/meta-openembedded,openembedded/meta-openembedded,VCTLabs/meta-openembedded,victronenergy/meta-openembedded,schnitzeltony/meta-openembedded,openembedded/meta-openembedded,openembedded/meta-openembedded,victronenergy/meta-openembedded,rehsack/meta-openembedded,openembedded/meta-openembedded,rehsack/meta-openembedded,victronenergy/meta-openembedded,schnitzeltony/meta-openembedded,moto-timo/meta-openembedded,schnitzeltony/meta-openembedded,victronenergy/meta-openembedded,rehsack/meta-openembedded,VCTLabs/meta-openembedded,schnitzeltony/meta-openembedded,schnitzeltony/meta-openembedded,rehsack/meta-openembedded,mrchapp/meta-openembedded,mrchapp/meta-openembedded,rehsack/meta-openembedded,lgirdk/meta-openembedded,moto-timo/meta-openembedded,moto-timo/meta-openembedded,openembedded/meta-openembedded,VCTLabs/meta-openembedded,lgirdk/meta-openembedded,mrchapp/meta-openembedded,lgirdk/meta-openembedded,schnitzeltony/meta-openembedded,schnitzeltony/meta-openembedded,VCTLabs/meta-openembedded,rehsack/meta-openembedded,victronenergy/meta-openembedded,openembedded/meta-openembedded,lgirdk/meta-openembedded,lgirdk/meta-openembedded,mrchapp/meta-openembedded,lgirdk/meta-openembedded,VCTLabs/meta-openembedded,mrchapp/meta-openembedded,mrchapp/meta-openembedded,lgirdk/meta-openembedded,victronenergy/meta-openembedded,moto-timo/meta-openembedded,openembedded/meta-openembedded,VCTLabs/meta-openembedded,victronenergy/meta-openembedded,openembedded/meta-openembedded,rehsack/meta-openembedded,mrchapp/meta-openembedded