Remove DARWIN define from osx builds as it cripples the feature set provided by

OSX headers.
Bug #154232 r=wtc sr=scc a=scc

configure

@@ -2848,7 +2848,7 @@ else
   echo "$ac_t""no" 1>&6
 fi
 
-for ac_prog in gawk mawk nawk awk
+for ac_prog in mawk gawk nawk awk
 do
 # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2

configure.in

@@ -759,9 +759,6 @@ case "$target" in
     ;;
 
 *-darwin*) 
-    AC_DEFINE(DARWIN)
-    AC_DEFINE(TARGET_CARBON)
-    AC_DEFINE(TARGET_API_MAC_CARBON)
     _PEDANTIC=
     CFLAGS="$CFLAGS -fpascal-strings -traditional-cpp -fno-common"
     CXXFLAGS="$CXXFLAGS -fpascal-strings -traditional-cpp -fno-common"
@@ -770,7 +767,6 @@ case "$target" in
     STRIP="$STRIP -x -S"
     case "${target_cpu}" in
     powerpc*)
-        AC_DEFINE(NO_X11)
         AC_DEFINE(XP_MACOSX)
         AC_DEFINE(TARGET_CARBON)
         AC_DEFINE(TARGET_API_MAC_CARBON)

nsprpub/pr/include/md/_darwin.cfg

@@ -39,10 +39,6 @@
 #define XP_UNIX
 #endif
 
-#ifndef DARWIN
-#define DARWIN
-#endif
-
 #define PR_AF_INET6 30  /* same as AF_INET6 */
 
 #if defined(i386)