Changes

xpp/echo_loader: make get_ver static

Fix the following errors seen with CFLAGS=-g in the master-dahdi-tools
job in jenkins:

  /usr/bin/ld: ./.libs/libecholoader.a(libecholoader_la-echo_loader.o): in function `init_octasic':
  /build/xpp/echo_loader.c:598:(.text+0x1777): undefined reference to `get_ver'
  /usr/bin/ld: ./.libs/libecholoader.a(libecholoader_la-echo_loader.o): in function `echo_ver':
  /build/xpp/echo_loader.c:883:(.text+0x2503): undefined reference to `get_ver'

Related: https://stackoverflow.com/a/77501693
Change-Id: I835d82c11f02c9635923d93fa36b46bbb46a9b48