misc: Look into the build directory for generated files

the bits/crc files are not inside the sourcedirectory but will end
in the build directory. Go and look there as well. This somehow
doesn't fail with make distcheck but when building for Yocto Dizzy.
diff --git a/src/ctrl/Makefile.am b/src/ctrl/Makefile.am
index 29a8ee2..610d75c 100644
--- a/src/ctrl/Makefile.am
+++ b/src/ctrl/Makefile.am
@@ -2,7 +2,7 @@
 # Please read Chapter 6 "Library interface versions" of the libtool documentation before making any modification
 LIBVERSION=0:0:0
 
-AM_CFLAGS = -Wall $(all_includes) -I$(top_srcdir)/include
+AM_CFLAGS = -Wall $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)/include
 
 lib_LTLIBRARIES = libosmoctrl.la
 
diff --git a/src/gb/Makefile.am b/src/gb/Makefile.am
index 83af71d..8a96628 100644
--- a/src/gb/Makefile.am
+++ b/src/gb/Makefile.am
@@ -2,7 +2,7 @@
 # Please read Chapter 6 "Library interface versions" of the libtool documentation before making any modification
 LIBVERSION=3:1:0
 
-AM_CFLAGS = -Wall ${GCC_FVISIBILITY_HIDDEN} -fno-strict-aliasing $(all_includes) -I$(top_srcdir)/include
+AM_CFLAGS = -Wall ${GCC_FVISIBILITY_HIDDEN} -fno-strict-aliasing $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)/include
 
 # FIXME: this should eventually go into a milenage/Makefile.am
 noinst_HEADERS = common_vty.h
diff --git a/src/gsm/Makefile.am b/src/gsm/Makefile.am
index 4207959..9c7df5a 100644
--- a/src/gsm/Makefile.am
+++ b/src/gsm/Makefile.am
@@ -2,7 +2,7 @@
 # Please read Chapter 6 "Library interface versions" of the libtool documentation before making any modification
 LIBVERSION=6:0:1
 
-AM_CFLAGS = -Wall ${GCC_FVISIBILITY_HIDDEN} $(all_includes) -I$(top_srcdir)/include
+AM_CFLAGS = -Wall ${GCC_FVISIBILITY_HIDDEN} $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)/include
 
 # FIXME: this should eventually go into a milenage/Makefile.am
 noinst_HEADERS = milenage/aes.h milenage/aes_i.h milenage/aes_wrap.h \
diff --git a/src/vty/Makefile.am b/src/vty/Makefile.am
index d45659e..2e234c8 100644
--- a/src/vty/Makefile.am
+++ b/src/vty/Makefile.am
@@ -2,7 +2,7 @@
 # Please read Chapter 6 "Library interface versions" of the libtool documentation before making any modification
 LIBVERSION=0:1:0
 
-AM_CFLAGS = -Wall $(all_includes) -I$(top_srcdir)/include
+AM_CFLAGS = -Wall $(all_includes) -I$(top_srcdir)/include -I$(top_builddir)/include
 
 if ENABLE_VTY
 lib_LTLIBRARIES = libosmovty.la