quagga : convert to autotools infrastructure & bump to 0.99.12

Changes by Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

 * Installation to target is the default
 * No installation to staging is the default
 * The QUAGGA_HEADERS option does not exist
 * BOA_INSTALL_TARGETS_CMDS wouldn't work in the Quagga package, and
   was anyway doing the default action
 * The QUAGGA_BINARY/QUAGGA_TARGET_BINARY variables were not used
 * Bump to 0.99.16, which fixes a problem when IPv6 is not enabled

Signed-off-by: cmchao <cmchao@gmail.com>

merge quagga