netipmid: Add -flto to CXXFLAGS

Following the example of openbmc/openbmc#3364, adding -flto to CXX flags
in order to reduce overall library and binary sizes.

Ref:
https://gcc.gnu.org/wiki/LinkTimeOptimization

Change-Id: Iad0c9ccf5c0409321da4aaef21882eb7171e14b0
Signed-off-by: Vernon Mauery <vernon.mauery@linux.intel.com>
1 file changed