Fix 'gap --version' to send its output to stdout and include a trailing newline

[fingolfin]

Also add a trailing newline.

Apparently it was printing to stdin before. Even after looking at the code I completely fail to see why it did that. But while I'd love to get to the bottom of this, let's first get this trivial fix out of the door.

[fingolfin]

OK it seems the issue is caused by our file descriptors not being initialized yet. The means the other SyFputs calls hidden by #ifdef GAP_MEM_CHECK in src/system.c may also have an issue and should be changed to fputs(..., stderr). But I can't easily test this code, but perhaps @ChrisJefferson is willing to patch those

[dimpase]

it looks like there are too many line breaks now:

$ ./gap --version
GAP 
4.14.0-22-g00e3a64
 built on 
2024-12-09 11:12:42-0600

[dimpase]

I can confirm that ./gap --version </dev/null no longer causes a crash.

[dimpase]

  C       src/gasman.c => build/obj/src/gasman.c.o
src/gasman.c: In function ‘enableMemCheck’:
src/gasman.c:1143:5: error: implicit declaration of function ‘fputs’ [-Wimplicit-function-declaration]
 1143 |     fputs("# Warning: --enableMemCheck causes SEVERE slowdowns. Starting GAP may take several days!\n", stderr);
      |     ^~~~~
src/gasman.c:138:1: note: include ‘<stdio.h>’ or provide a declaration of ‘fputs’
  137 | #include <sys/mman.h>
  +++ |+#include <stdio.h>
  138 | #endif
src/gasman.c:1143:105: error: ‘stderr’ undeclared (first use in this function)
 1143 |     fputs("# Warning: --enableMemCheck causes SEVERE slowdowns. Starting GAP may take several days!\n", stderr);
      |                                                                                                         ^~~~~~
src/gasman.c:1143:105: note: ‘stderr’ is defined in header ‘<stdio.h>’; this is probably fixable by adding ‘#include <stdio.h>’
src/gasman.c:1143:105: note: each undeclared identifier is reported only once for each function it appears in
make: *** [Makefile.rules:426: build/obj/src/gasman.c.o] Error 1

[dimpase]

lgtm

[fingolfin]

Backported to stable-4.14 in eeba5ab1b47d2c20cdaa0302b162ce7264c38f82