use a cache for resolving tags in libmount_parse() api

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Hi Systemd-devel Team,
I am trying to include a function mnt_new_cache() in systemd.
I had changed the signature of a few existing function of systemd.

I get the below compile error.

kpit@L-16522:systemd$ ninja -C build
ninja: Entering directory `build'
[833/2203] Linking target systemd
FAILED: systemd 
cc  -o systemd systemd.p/src_core_main.c.o systemd.p/src_core_crash-handler.c.o -Wl,--as-needed -Wl,--no-undefined -fstack-protector '-Wl,-rpath,$ORIGIN/src/core:$ORIGIN/src/shared' -Wl,-rpath-link,/home/kpit/a1-velai/code/systemd/4mgithub/another-sd/systemd/build/src/core -Wl,-rpath-link,/home/kpit/a1-velai/code/systemd/4mgithub/another-sd/systemd/build/src/shared -Wl,--start-group src/core/libsystemd-core-256.so src/shared/libsystemd-shared-256.so -Wl,--end-group -Wl,--fatal-warnings -Wl,-z,now -Wl,-z,relro -Wl,--warn-common
/usr/bin/ld: systemd.p/src_core_main.c.o: undefined reference to symbol 'mnt_new_cache@@MOUNT_2.19'
/usr/bin/ld: /lib/x86_64-linux-gnu/libmount.so.1: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
[842/2203] Generating src/test/test-libsystemd-sym.c with a custom command (wrapped by meson to capture output)
ninja: build stopped: subcommand failed.
kpit@L-16522:systemd$

Anything wrong in my compilation though i had included necessary header file.
Signature change in function is present and will it be accepted, assuming compilation is successful.
I read in contribution webpage, that if there occurs signature change in function, then those change shall be ignored or dimissed or if there is a possbility of having the change as an interface, systemd team will consider after reviewing.

Please let me know the above queries.
Thank you
rajmohan
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