Turn on pedantic and Wcomment. No more C++ comments in C code ;)

This commit was SVN r963.

config/lam_setup_cc.m4

@@ -42,6 +42,7 @@ LAM_CFLAGS_BEFORE_PICKY="$CFLAGS"
 if test "$GCC" = "yes" -a "$WANT_PICKY_COMPILER" = 1; then
     add="-Wall -Wundef -Wno-long-long"
     add="$add -Wmissing-prototypes -Wstrict-prototypes"
+    add="$add -Wcomment -pedantic"
 
     # see if -Wno-long-double works...
     CFLAGS_orig="$CFLAGS"