build: do not export compat functions from lib

Commits 9db2145272 ("lib/gen-version-script.h: add getline and
getdelim to notmuch.sym if needed") and 3242e29e57 ("build: add
canonicalize_file_name to symbols exported from libnotmuch.so")
started exporting compat functions from libnotmuch so that the cli
could use them. But we shouldn't export such functions from the
library. They are not part of our ABI. Instead, the cli should include
its own copies of the compat functions.

Makefile.local

@@ -212,6 +212,7 @@ dataclean: distclean
 	rm -rf $(DATACLEAN)
 
 notmuch_client_srcs =		\
+	$(notmuch_compat_srcs)	\
 	command-line-arguments.c\
 	debugger.c		\
 	status.c		\

lib/gen-version-script.sh

@@ -24,6 +24,5 @@ while read sym; do
 	    ;;
     esac
 done
-nm $* | awk '$1 ~ "^[0-9a-fA-F][0-9a-fA-F]*$" && $2 == "T" && $3 ~ "^(getline|getdelim|canonicalize_file_name)$" {print $3 ";"}'
 sed  -n 's/^[[:space:]]*\(notmuch_[a-z_]*\)[[:space:]]*(.*/ \1;/p' $HEADER
 printf "local: *;\n};\n"