[libstdc++] Build system cleanup 12/n

[Kelley Cook]

This just tidies up Mark's group function check macro to use some m4 
magic to eliminate an unnessecary shell out and like the other linkage 
check macros, check for the underscored macros only when the 
non-underscored functions were not present.  The m4 macro funclist just 
changes all whitespace and punctuation in $3 to be a single " ".

For clarity, the diff in the generated configure snippet looks like this:

@@ -11304,9 +11304,7 @@ cat >>conftest.$ac_ext <<_ACEOF
 int
 main ()
 {
- `for x in acosf asinf atanf \
-                                          cosf sinf tanf \
-                                          coshf sinhf tanhf; do echo 
"$x (0);"; done`
+acosf (0); asinf (0); atanf (0); cosf (0); sinf (0); tanf (0); coshf 
(0); sinhf (0); tanhf (0);
   ;
   return 0;
 }
@@ -11361,9 +11359,7 @@ echo "${ECHO_T}$glibcxx_cv_func_float_tr



-for ac_func in acosf asinf atanf \
-                                          cosf sinf tanf \
-                                          coshf sinhf tanhf
+for ac_func in acosf asinf atanf cosf sinf tanf coshf sinhf tanhf
 do
 as_ac_var=`echo "ac_cv_func_$ac_func" | $as_tr_sh`
 echo "$as_me:$LINENO: checking for $ac_func" >&5

Then of course, there is no need for the seperate call to the macro look 
for the underscored functions.

Also this patch makes the next patch very easy.

OK?
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