Fix link error during "make check"

[Bruno Haible]

On CentOS 7.8, after installing the prerequisites
  sudo yum install gc-devel readline-devel json-c-devel tcl-devel tk-devel 
dejagnu

building poke works fine, however "make check" fails:


/bin/sh ../../libtool  --tag=CC   --mode=link gcc -std=gnu11  -g -O2  
-L/home/bruno/inst-x86_64-64/lib -o values  values-values.o ../../gl/libgnu.la 
../../libpoke/libpoke.la  
libtool: link: gcc -std=gnu11 -g -O2 -o .libs/values values-values.o  
-L/home/bruno/inst-x86_64-64/lib ../../gl/.libs/libgnu.a -lreadline 
../../libpoke/.libs/libpoke.so -L/home/bruno/poke-0.90/build-64/jitter/lib 
-lncurses -ltermcap -lm -lgc -pthread -Wl,-rpath 
-Wl,/home/bruno/inst-x86_64-64/lib
values-values.o: In function `test_simple_values':
/home/bruno/poke-0.90/build-64/testsuite/poke.libpoke/../../../testsuite/poke.libpoke/values.c:63:
 undefined reference to `fail'
/home/bruno/poke-0.90/build-64/testsuite/poke.libpoke/../../../testsuite/poke.libpoke/values.c:66:
 undefined reference to `pass'
/home/bruno/poke-0.90/build-64/testsuite/poke.libpoke/../../../testsuite/poke.libpoke/values.c:67:
 undefined reference to `fail'
/home/bruno/poke-0.90/build-64/testsuite/poke.libpoke/../../../testsuite/poke.libpoke/values.c:68:
 undefined reference to `fail'
/home/bruno/poke-0.90/build-64/testsuite/poke.libpoke/../../../testsuite/poke.libpoke/values.c:71:
 undefined reference to `pass'
...
collect2: error: ld returned 1 exit status
make[3]: *** [values] Error 1

This proposed patch fixes it.

Since we currently only support GCC and compatible compilers (see
<https://lists.gnu.org/archive/html/poke-devel/2021-02/msg00130.html>),
we can add the '-fgnu89-inline' option unconditionally.

0001-Fix-link-error-during-make-check.patch
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