build: Link -losmocore last to please Ubuntu linker

It seems that the Ubuntu linker is quite picky in where it is looking
for symbols. Link libosmocore (and as such talloc) last of the Osmocom
libraries. This could fix:

gcc -Wall -I/usr/include/ -I/usr/include/ -I/usr/include/ -I/usr/include/   -DNO_UNIPORTE -g -O2 -fdebug-prefix-map=/usr/src/packages/BUILD=. -fstack-protector-strong -Wformat -Werror=format-security  -Wl,-Bsymbolic-functions -Wl,-z,relro -o cellmgr_ng main.o mtp_layer3.o thread.o ipaccess.o pcap.o bss_patch.o bssap_sccp.o bsc_sccp.o bsc_ussd.o links.o msc_conn.o link_udp.o snmp_mtp.o debug.o isup.o mtp_link.o counter.o sccp_state.o bsc.o ss7_application.o vty_interface_legacy.o vty_interface_cmds.o mgcp_patch.o mgcp_callagent.o isup_filter.o -ltalloc -losmocore -ltalloc -losmogsm -losmocore -ltalloc -losmovty -losmocore -losmosccp -losmoxua  -lpthread -lnetsnmp -lcrypto
[   79s] /usr/lib/gcc/x86_64-linux-gnu/6/../../../x86_64-linux-gnu/libosmosccp.so: undefined reference to `talloc_free'

Change-Id: I94c87496ebffd41a6217d860b0ca4bed6ff2d24c
1 file changed