Fix header includes and reduce overlinking

[diabonas]

• tpm2-totp.h doesn't need to include the full tss2/tss2_esys.h because it doesn't any of these functions or types, it only needs tss2/tss2_tcti.h for the TSS2_TCTI_CONTEXT type. Also remove some unnecessary or duplicate headers with the help of deheader.
• Don't add libqrencode and libdl to every binary and library, but only to the ones that actually use them. This reduces overlinking, which can be detected using ldd -u -r. It doesn't fix all problems though:
  • libtpm2-totp.so includes an unnecessary reference to libtss2-sys.so. This is an upstream problem with the tpm2-tss pkg-config files, see https://github.com/tpm2-software/tpm2-tss/pull/1417 for a potential solution.
  • tss2-esys is unnecessarily linked into all binaries while it would be enough for them to depend on libtpm2-totp.so. Similar to the changes to libqrencode and libdl, we can remove it from AM_CFLAGS/AM_LDADD, but this doesn't help since we use libtool which automatically links all library dependencies into any binary using the library. Changing this behaviour requires a patched version of libtool as provided e.g. by Debian.

[codecov[bot]]

Codecov Report

Merging #30 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #30   +/-   ##
=======================================
  Coverage   80.46%   80.46%           
=======================================
  Files           5        5           
  Lines         819      819           
=======================================
  Hits          659      659           
  Misses        160      160

Impacted Files	Coverage Δ
src/libtpm2-totp.c	84.66% <ø> (ø)	:arrow_up:
test/libtpm2-totp.c	81.25% <ø> (ø)	:arrow_up:
src/tpm2-totp-tcti.c	52.23% <ø> (ø)	:arrow_up:
src/plymouth-tpm2-totp.c	77.02% <ø> (ø)	:arrow_up:

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