vim-patch:9.0.2180: POSIX function name in exarg causes issues (#28308)

Problem:  POSIX function name in exarg struct causes issues
          on OpenVMS
Solution: Rename getline member in exarg struct to ea_getline,
          remove isinf() workaround for VMS

There are compilers that do not treat well POSIX functions - like
getline - usage in the structs.

Older VMS compilers could digest this... but the newer OpenVMS compilers
( like VSI C x86-64 X7.4-843 (GEM 50XB9) ) cannot deal with these
structs. This could be limited to getline() that is defined via
getdelim() and might not affect all POSIX functions in general - but
avoiding POSIX function names usage in the structs is a "safe side"
practice without compromising the functionality or the code readability.

The previous OpenVMS X86 port used a workaround limiting the compiler
capabilities using __CRTL_VER_OVERRIDE=80400000
In order to make the OpenVMS port future proof, this pull request
proposes a possible solution.

closes: vim/vim#13704

6fdb628082

Co-authored-by: Zoltan Arpadffy <zoltan.arpadffy@gmail.com>

src/nvim/usercmd.c

@@ -1724,7 +1724,7 @@ int do_ucmd(exarg_T *eap, bool preview)
     save_current_sctx = current_sctx;
     current_sctx.sc_sid = cmd->uc_script_ctx.sc_sid;
   }
-  do_cmdline(buf, eap->getline, eap->cookie,
+  do_cmdline(buf, eap->ea_getline, eap->cookie,
              DOCMD_VERBOSE|DOCMD_NOWAIT|DOCMD_KEYTYPED);
 
   // Careful: Do not use "cmd" here, it may have become invalid if a user