regen-makefile.sh: Put libraries in LINUX_LIBS, not LDFLAGS

Additional libraries to be linked should be in LINUX_LIBS (appended at
the end of the linker command), not part of LDFLAGS (prepended to
the beginning of the linker command).

On binutils 2.35.1 / Debian unstable, without this patch, I get

/usr/bin/ld: IPL4asp_PT.so: undefined reference to `sctp_bindx'
/usr/bin/ld: IPL4asp_PT.so: undefined reference to `sctp_connectx'

which is resolved by this patch

Change-Id: I8a339076f445e3c650e407ae982c7c2dc4a760b2
diff --git a/sgsn/regen_makefile.sh b/sgsn/regen_makefile.sh
index 1d1411e..55ff26f 100755
--- a/sgsn/regen_makefile.sh
+++ b/sgsn/regen_makefile.sh
@@ -6,4 +6,4 @@
 
 ../regen-makefile.sh SGSN_Tests.ttcn $FILES
 
-sed -i -e 's/^LINUX_LIBS = -lxml2/LINUX_LIBS = -lxml2 -lfftranscode/' Makefile
+sed -i -e 's/^LINUX_LIBS = -lxml2 -lsctp/LINUX_LIBS = -lxml2 -lsctp -lfftranscode/' Makefile