soleta_git.bb: fix HOSTCC mess
soleta_git.bb: fix HOSTCC mess

Should fix #97

Soletta was considering HOSTCC, if not set, should be composed
by (HOST_PREFIX)(CC).

Looks like in this case HOST_PREFIX = x86_64-ostro-linux- and
CC = x86_64-ostro-linux-gcc

So HOSTCC was wrong.

Signed-off-by: Bruno Dilly <ea4fb6320c1221b6a559089d8ab97ffc53fc6586@intel.com>

solettaproject/meta-soletta,brunobottazzini/meta-soletta,solettaproject/meta-soletta,brunobottazzini/meta-soletta