host-build: fix stampfile name substitution per installed binaries

A funny bug was discovered where if the buildroot's path
has the name of the build target within it, it will also be substituted
along with the stampfile's name for each program,
causing an attempt to touch a file in a directory that doesn't exist.

...
...
touch: cannot touch '/Volumes/touch/openwrt/staging_dir/host/stamp/.touch_installed': No such file or directory
touch: cannot touch '/Volumes/ln/openwrt/staging_dir/host/stamp/.ln_installed': No such file or directory
touch: cannot touch '/Volumes/chown/openwrt/staging_dir/host/stamp/.chown_installed': No such file or directory
make[2]: *** [Makefile:50: /Volumes/coreutils/openwrt/staging_dir/host/stamp/.coreutils_installed] Error 1
...
...

Split up the path with $(dir) and $(notdir) before substitution to fix
the syntax.

Reported-by: Georgi Valkov <[email protected]>
Tested-by: Georgi Valkov <[email protected]> # MacOS
Signed-off-by: Michael Pratt <[email protected]>
Signed-off-by: Tony Ambardar <[email protected]>

include/host-build.mk

@@ -26,7 +26,7 @@ HOST_STAMP_CONFIGURED:=$(HOST_BUILD_DIR)/.configured
 HOST_STAMP_BUILT:=$(HOST_BUILD_DIR)/.built
 HOST_BUILD_PREFIX?=$(if $(IS_PACKAGE_BUILD),$(STAGING_DIR_HOSTPKG),$(STAGING_DIR_HOST))
 HOST_STAMP_INSTALLED:=$(HOST_BUILD_PREFIX)/stamp/.$(PKG_NAME)_installed
-HOST_STAMP_PROGRAMS:=$(foreach program,$(PKG_PROGRAMS),$(subst $(PKG_NAME),$(program),$(HOST_STAMP_INSTALLED)) )
+HOST_STAMP_PROGRAMS:=$(foreach program,$(PKG_PROGRAMS),$(dir $(HOST_STAMP_INSTALLED))$(subst $(PKG_NAME),$(program),$(notdir $(HOST_STAMP_INSTALLED))) )
 
 override MAKEFLAGS=