[U-Boot] [PATCH 1/6] kbuild: bug fixes and cleanups of Makefile.host

This commit imports updates of scripts/Makefile.host from Linux 3.18-rc1. Imported commits are: [1] commit d8d9efe22709 by Masahiro Yamada kbuild: fix a typo in scripts/Makefile.host [2] commit edb950c17de0 by Masahiro Yamada kbuild: fix a bug of C++ host program handling [3] commit 62e2210

[U-Boot] [PATCH 1/6] kbuild: bug fixes and cleanups of Makefile.host

This commit imports updates of scripts/Makefile.host from Linux 3.18-rc1. Imported commits are: [1] commit d8d9efe22709 by Masahiro Yamada kbuild: fix a typo in scripts/Makefile.host [2] commit edb950c17de0 by Masahiro Yamada kbuild: fix a bug of C++ host program handling [3] commit 62e2210