wget2 | gl_LT/LIBOBJS contain only fn_match on 2.0.1 under Cygwin (#618)

[Brian Inglis (@BrianInglis)]

Brian Inglis created an issue: https://gitlab.com/gnuwget/wget2/-/issues/618



All `libtool link` steps fail with undefined reference to `wget_...` as 
`gl_LT/lt/LIBOBJS/libobjs` contain only one entry on 2.0.1 under Cygwin: see 
below for a sample from a single link.

Import library archive 
.../wget2/wget2-2.0.1-1.x86_64/build/libwget/.libs/libwget.dll.a is only ~1.5KB 
on 2.0.1, instead of ~500KB on 2.0.0, where everything built fine with no 
issues, although the SO/DLL is 2.2MB in both cases! 

No obvious relevant differences between files using `gl_LT/lt/LIBOBJS/libobjs`. 

Need pointers to where those variables are set or accumulated in the build. 

CI job log is available at [Cygwin Scallywag CI Github 
Action](https://github.com/cygwin/scallywag/actions/runs/3626478207/jobs/6115545281)

```
libtool: link: gcc -DMALLOC_RETURNS_NONNULL -I/usr/include/p11-kit-1 -DNDEBUG 
-ggdb -O2 -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 
-fstack-protector-strong --param=ssp-buffer-size=4 
-fdebug-prefix-map=.../wget2/wget2-2.0.1-1.x86_64/build=/usr/src/debug/wget2-2.0.1-1
 
-fdebug-prefix-map=.../wget2/wget2-2.0.1-1.x86_64/src/wget2-2.0.1=/usr/src/debug/wget2-2.0.1-1
 -Wno-char-subscripts -fno-PIC -o .libs/batch_loader.exe batch_loader.o  
../lib/.libs/libgnu.a ../libwget/.libs/libwget.dll.a -lwget -lpthread -liconv 
-lintl -lpcre2-8 -lidn2 -lzstd -lbrotlidec -llzma -lz -lbz2 -lgpgme -lnghttp2 
-lpsl -lgnutls -L.../wget2/wget2-2.0.1-1.x86_64/build/libwget/.libs
...
/usr/lib/gcc/x86_64-pc-cygwin/11/../../../../x86_64-pc-cygwin/bin/ld: 
batch_loader.o: in function `downloader_thread':
/usr/src/debug/wget2-2.0.1-1/examples/batch_loader.c:172: undefined reference 
to `wget_strncasecmp_ascii'
/usr/lib/gcc/x86_64-pc-cygwin/11/../../../../x86_64-pc-cygwin/bin/ld: 
/usr/src/debug/wget2-2.0.1-1/examples/batch_loader.c:174: undefined reference 
to `wget_strncasecmp_ascii'
...
collect2: error: ld returned 1 exit status
libtool: link: gcc -DMALLOC_RETURNS_NONNULL -I/usr/include/p11-kit-1 -DNDEBUG 
-ggdb -O2 -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 
-fstack-protector-strong --param=ssp-buffer-size=4 
-fdebug-prefix-map=.../wget2/wget2-2.0.1-1.x86_64/build=/usr/src/debug/wget2-2.0.1-1
 
-fdebug-prefix-map=.../wget2/wget2-2.0.1-1.x86_64/src/wget2-2.0.1=/usr/src/debug/wget2-2.0.1-1
 -Wno-char-subscripts -fno-PIC -o .libs/http_multi_get.exe http_multi_get.o  
../lib/.libs/libgnu.a ../libwget/.libs/libwget.dll.a -lwget -lpthread -liconv 
-lintl -lpcre2-8 -lidn2 -lzstd -lbrotlidec -llzma -lz -lbz2 -lgpgme -lnghttp2 
-lpsl -lgnutls -L.../wget2/wget2-2.0.1-1.x86_64/build/libwget/.libs
make[2]: *** [Makefile:1939: getstream.exe] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: *** [Makefile:1931: batch_loader.exe] Error 1
```

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