Allow setting ICECC_VERSION in the autogen.input.

That way you can avoid having to set ICECC_VERSION in every shell where you
want to use icecream with cross-compilation.  See

http://holesovsky.blogspot.cz/2015/02/using-icecream-to-speed-up-libreoffice.html

for details.

Change-Id: I1adf67934c2687f0fca1b73e7793b72120eeedab

config_host.mk.in

@@ -268,6 +268,7 @@ export HUNSPELL_LIBS=$(gb_SPACE)@HUNSPELL_LIBS@
 export HYPHEN_LIB=$(gb_SPACE)@HYPHEN_LIB@
 export HYPH_SYSTEM_DIR=@HYPH_SYSTEM_DIR@
 export ICECREAM_RUN=@ICECREAM_RUN@
+@x_ICECC_VERSION@ export ICECC_VERSION=@ICECC_VERSION@
 export ICU_CFLAGS=$(gb_SPACE)@ICU_CFLAGS@
 export ICU_LIBS=$(gb_SPACE)@ICU_LIBS@
 export ICU_MAJOR=@ICU_MAJOR@

configure.ac

@@ -12636,6 +12636,17 @@ else
 fi
 AC_SUBST(ICECREAM_RUN)
 
+dnl ===================================================================
+dnl Setup the ICECC_VERSION for the build the same way it was set for
+dnl configure, so that CC/CXX and ICECC_VERSION are in sync
+dnl ===================================================================
+x_ICECC_VERSION=[\#]
+if test -n "$ICECC_VERSION" ; then
+    x_ICECC_VERSION=
+fi
+AC_SUBST(x_ICECC_VERSION)
+AC_SUBST(ICECC_VERSION)
+
 dnl ===================================================================
 
 AC_MSG_CHECKING([MPL subset])