libgcc: use the new recipe (rather than gcc-runtime) to install libgcc_s.so* and crt*.o

Currently gcc-runtime installs the files, but actually gcc-runtime's
do_configure checks if the files are available, so before we build gcc-runtime,
we should have some recipe install the files first! -- currently
gcc-cross-intermediate actually does that(gcc-cross also installs the files,
but it installs into the gcc-build-internal* directory), but
gcc-cross-intermediate will have its own sysroot in future, after that,
gcc-runtime won't build. So let us add this new target recipe and move the
installation of the files from gcc-runtime into it.

Signed-off-by: Dexuan Cui <dexuan.cui@intel.com>

meta/recipes-devtools/gcc/gcc-package-runtime.inc

@@ -1,6 +1,4 @@
 PACKAGES = "\
-  libgcc \
-  libgcc-dev \
   libstdc++ \
   libstdc++-precompile-dev \
   libstdc++-dev \
@@ -14,12 +12,6 @@ PACKAGES = "\
   libmudflap-dev \
 "
 
-FILES_libgcc = "${base_libdir}/libgcc*.so.*"
-FILES_libgcc-dev = " \
-  ${base_libdir}/libgcc*.so \
-  ${libdir}/${TARGET_SYS}/${BINV}/crt* \
-  ${libdir}/${TARGET_SYS}/${BINV}/libgcc*"
-
 FILES_libg2c = "${target_libdir}/libg2c.so.*"
 FILES_libg2c-dev = "\
   ${libdir}/libg2c.so \