rpm: correct tool path in macros for no usrmerge

While no usrmerge in sysvinit, some tools defined in rpm macro have wrong path

$ echo 'INIT_MANAGER="sysvinit"'  >> conf/local.conf
$ echo 'IMAGE_INSTALL:append = " rpm busybox"' >> conf/local.conf
$ bitbake core-image-minimal
$ runqemu tmp/deploy/images/qemux86-64/core-image-minimal-qemux86-64.rootfs.qemuboot.conf

root@qemux86-64:~# which sed tar rm mkdir cp cat chown chmod gzip grep mv
/bin/sed
/bin/tar
/bin/rm
/bin/mkdir
/bin/cp
/bin/cat
/bin/chown
/bin/chmod
/bin/gzip
/bin/grep
/bin/mv

root@qemux86-64:~# rpm --eval "%{__sed} %{__tar} %{__rm} %{__mkdir} %{__cp} %{__cat} %{__chown} %{__chmod} %{__gzip} %{__grep} %{__mv}"
/usr/bin/sed /usr/bin/tar /usr/bin/rm /usr/bin/mkdir /usr/bin/cp /usr/bin/cat /usr/bin/chown /usr/bin/chmod /usr/bin/gzip /usr/bin/grep /usr/bin/mv

Here to explain how __rm was set in rpm during build. The build system
of rpm is cmake. Take rpm rpm-4.19.x for example:

The '__RM rm' is defected by findutil [1], and function findutil
calls find_program to search for tool, if not found on host, then
hardcode with "/usr/bin" prefix [2]

Yocto explicitly set OECMAKE_FIND_ROOT_PATH_MODE_PROGRAM = "ONLY" [3][4]
to search tools from CMAKE_FIND_ROOT_PATH [5] which locates in recipe sysroot,
if not found in recipe sysroot, hardcode with "/usr/bin" prefix

If "${base_bindir}" != "${bindir}, explicitly correct tools in rpm
macros, use ${base_bindir} to instead original ${bindir}. Only do the
operation for target, it is not necessary for native and nativesdk,
because most host distribution supports usrmerge

After applying this commit, on target:

root@qemux86-64:~# rpm --eval "%{__sed} %{__tar} %{__rm} %{__mkdir} %{__cp} %{__cat} %{__chown} %{__chmod} %{__gzip} %{__grep} %{__mv}"
/bin/sed /bin/tar /bin/rm /bin/mkdir /bin/cp /bin/cat /bin/chown /bin/chmod /bin/gzip /bin/grep /bin/mv

root@qemux86-64:~# ls /bin/sed /bin/tar /bin/rm /bin/mkdir /bin/cp /bin/cat /bin/chown /bin/chmod /bin/gzip /bin/grep /bin/mv
/bin/cat    /bin/chmod  /bin/chown  /bin/cp     /bin/grep   /bin/gzip   /bin/mkdir  /bin/mv     /bin/rm     /bin/sed    /bin/tar

In order to save size, this commit does not add these tools to
runtime depends, user should explicitly add them if necessary
(such as use rpm to build packages)

[1] https://github.com/rpm-software-management/rpm/blob/rpm-4.19.x/CMakeLists.txt#L121
[2] https://github.com/rpm-software-management/rpm/blob/rpm-4.19.x/CMakeLists.txt#L59
[3] https://git.openembedded.org/openembedded-core/commit/?id=f4ea12f6635125ee793f4dd801c538c0186f9dc3
[4] https://cmake.org/cmake/help/latest/variable/CMAKE_FIND_ROOT_PATH_MODE_PROGRAM.html
[5] https://git.openembedded.org/openembedded-core/tree/meta/classes-recipe/cmake.bbclass?id=f4ea12f6635125ee793f4dd801c538c0186f9dc3#n123

(From OE-Core rev: c89c7177be2df5d2be44478a6ac43b35ad46db9e)

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/rpm/rpm_4.20.0.bb

@@ -101,6 +101,8 @@ WRAPPER_TOOLS = " \
    ${libdir}/rpm/rpmdeps \
 "
 
+base_bindir_progs = "sed tar rm mv mkdir cp cat chown chmod gzip grep"
+
 do_install:append:class-native() {
         for tool in ${WRAPPER_TOOLS}; do
                 test -x ${D}$tool && create_wrapper ${D}$tool \
@@ -123,9 +125,15 @@ do_install:append:class-nativesdk() {
 	EOF
 }
 
-# Rpm's make install creates var/tmp which clashes with base-files packaging
 do_install:append:class-target() {
+    # Rpm's make install creates var/tmp which clashes with base-files packaging
     rm -rf ${D}/var
+
+    if [ "${base_bindir}" != "${bindir}" ]; then
+        for prog in ${base_bindir_progs}; do
+            sed -i "s|^%__${prog}.*|%__${prog}  ${base_bindir}/${prog}|g" ${D}${libdir}/rpm/macros
+        done
+    fi
 }
 do_install:append:class-nativesdk() {
     rm -rf ${D}${SDKPATHNATIVE}/var