tools:regression:benchmark: Quote CFLAGS
tools:regression:benchmark: Quote CFLAGS

Quote gawk CFLAGS argument

Signed-off-by: Ola Jeppsson <793f970c52ded1276b9264c742f19d1888cbaf73@adapteva.com>

aolofsson/pal,olajep/pal,aolofsson/pal,Adamszk/pal3,olajep/pal,parallella/pal,8l/pal,debug-de-su-ka/pal,mateunho/pal,parallella/pal,parallella/pal,mateunho/pal,Adamszk/pal3,debug-de-su-ka/pal,debug-de-su-ka/pal,aolofsson/pal,eliteraspberries/pal,Adamszk/pal3,eliteraspberries/pal,olajep/pal,debug-de-su-ka/pal,olajep/pal,mateunho/pal,mateunho/pal,parallella/pal,mateunho/pal,8l/pal,8l/pal,8l/pal,Adamszk/pal3,eliteraspberries/pal,eliteraspberries/pal,debug-de-su-ka/pal,aolofsson/pal,parallella/pal,eliteraspberries/pal