build: Remove the old PIC/PIE patch, let libtool sort it out

* Remove the old change from '08 to add in PIE arguments at automake level.
  Versions of libtool since then know how to deal with -fpie and do the right
  thing according to whether its building shared or executable objects.
  So just pass '-fpie' as CFLAG and let libtool do its thing.
diff --git a/watchquagga/Makefile.am b/watchquagga/Makefile.am
index 939ecd7..1f05f26 100644
--- a/watchquagga/Makefile.am
+++ b/watchquagga/Makefile.am
@@ -3,8 +3,7 @@
 AM_CPPFLAGS = -I$(top_srcdir) -I$(top_srcdir)/lib -I$(top_builddir)/lib
 DEFS = @DEFS@ -DSTATEDIR=\"$(localstatedir)/\"
 
-AM_CFLAGS = $(PICFLAGS) $(WERROR)
-AM_LDFLAGS = $(PILDFLAGS)
+AM_CFLAGS = $(WERROR)
 
 sbin_PROGRAMS = watchquagga