Revert "gn_base.bbclass: Make build dir path checking more robust"

This reverts commit 82e0bd85.

The build directory is created in the do_configure task that is executing GN
which relies on the build directory check. The os.path.samefile() raises an
exception when os.stat() fails and therefore cannot be used to compare paths
of non-existing directories.

Signed-off-by: Robert Drab <robert.drab@huawei.com>

meta-oniro-staging/classes/gn_base.bbclass

@@ -52,7 +52,7 @@ EXPORT_FUNCTIONS do_configure do_compile do_install
 python do_check_B_is_not_S() {
     bpath = os.path.abspath(d.expand("${B}"))
     spath = os.path.abspath(d.expand("${S}"))
-    if os.path.samefile(bpath, spath):
+    if os.path.abspath(d.expand("${S}")) == os.path.abspath(d.expand("${B}")):
         bb.fatal('''
 GN requires build and sources directories to be different. By default build
 directory is set to ${WORKDIR}/out. If you're using devtool remember to use