dectalk: compilation ignores MacPorts flags

[aeiouaeiouaeiouaeiouaeiouaeiou]

I'm trying to fix a build on older systems and found that the configure ignores linking and compile flags.

Example: ​https://build.macports.org/builders/ports-14_arm64-builder/builds/31886/steps/install-port/logs/stdio

/usr/bin/clang -c -MMD -g -O2 -Wall -Wno-missing-braces -Wno-pointer-sign -Wno-unused-variable -Wno-unused-but-set-variable -Wno-unused-function -I../include -I../api -I../cmd -I/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_audio_dectalk/dectalk/work/dectalk-2023-10-30/src/dapi/build/dic/23.2.0/la/release -I../kernel -I../lts -I../nt -I../osf -I../ph -I../../../ -I../protos -I../vtm -I. -I/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_audio_dectalk/dectalk/work/dectalk-2023-10-30/src/dapi/build/dectalk//la/release/include  -D_REENTRANT -DNOMME -DLTSSIM -DTTSSIM -DANSI -DBLD_DECTALK_DLL -DSPANISH -DSPANISH_LA -DDECTALK_INSTALL_PREFIX=\"/opt/local\" -DACCESS32 -DTYPING_MODE  -o ../../build/dectalk/23.2.0/la/release/link/cm_char.o cm_char.c

Here it should be -Os -arch arm64 instead of -g -O2.

What follows is even weirder, since gcc is used:

gcc -c -MMD -g -O2 -Wall -Wno-missing-braces -Wno-pointer-sign -Wno-unused-variable -Wno-unused-but-set-variable -Wno-unused-function -I../include -I../api -I../cmd -I/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_audio_dectalk/dectalk/work/dectalk-2023-10-30/src/dapi/build/dic/23.2.0/uk/release -I../kernel -I../lts -I../nt -I../osf -I../ph -I../../../ -I../protos -I../vtm -I/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_audio_dectalk/dectalk/work/dectalk-2023-10-30/src/dapi/build/dectalk//uk/release/include  -D_REENTRANT -DNOMME -DLTSSIM -DTTSSIM -DANSI -DBLD_DECTALK_DLL -DENGLISH -DENGLISH_UK -DDECTALK_INSTALL_PREFIX=\"/opt/local\" -DACCESS32 -DTYPING_MODE  -o ../../build/dic/23.2.0/uk/release/link/dic.o dic.c