Respect environment CPPFLAGS when we run ./configure so we can inject

 random -D things without having to set CFLAGS/ASFLAGS

 diff -durN glibc-2.10.1.orig/Makeconfig glibc-2.10.1/Makeconfig

 --- glibc-2.10.1.orig/Makeconfig	2009-05-09 23:57:56.000000000 +0200

 +++ glibc-2.10.1/Makeconfig	2009-11-13 00:49:41.000000000 +0100

 @@ -672,6 +672,7 @@

  	   $(foreach lib,$(libof-$(basename $(@F))) \

  		         $(libof-$(<F)) $(libof-$(@F)),$(CPPFLAGS-$(lib))) \

  	   $(CPPFLAGS-$(<F)) $(CPPFLAGS-$(@F)) $(CPPFLAGS-$(basename $(@F)))

 +CPPFLAGS += $(CPPFLAGS-config)

  override CFLAGS	= -std=gnu99 $(gnu89-inline-CFLAGS) \

  		  $(filter-out %frame-pointer,$(+cflags)) $(+gccwarn-c) \

  		  $(sysdep-CFLAGS) $(CFLAGS-$(suffix $@)) $(CFLAGS-$(<F)) \

 diff -durN glibc-2.10.1.orig/config.make.in glibc-2.10.1/config.make.in

 --- glibc-2.10.1.orig/config.make.in	2009-05-09 17:59:38.000000000 +0200

 +++ glibc-2.10.1/config.make.in	2009-11-13 00:49:41.000000000 +0100

 @@ -103,6 +103,7 @@

  CXX = @CXX@

  BUILD_CC = @BUILD_CC@

  CFLAGS = @CFLAGS@

 +CPPFLAGS-config = @CPPFLAGS@

  ASFLAGS-config = @ASFLAGS_config@

  AR = @AR@

  RANLIB = @RANLIB@