meta-oe: onig: avoid using 'install' with both -D and -t options

Older versions of 'install' (prior to 8.23) do not allow the -D and -t
options to be used together. (see coreutils commit 15d092f94a3a
[install: allow options -D and -t to be used together]). On build
hosts such as CentOS7, which has install v8.22, we therefor see a
failure: install:

    failed to access ‘...onig/6.9.4-r0/image/usr/lib64/onig/ptest/tests/’:
        No such file or directory

We definitely don't want to avoid using useful features of tools but
throughout meta-openembedded the mkdir approach is used so let's stick
to it and avoid causing undo issues at the expense of one extra line
of code.

Signed-off-by: Mark Asselstine <mark.asselstine@windriver.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-oe/recipes-support/onig/onig_6.9.4.bb

@@ -28,5 +28,6 @@ do_compile_ptest() {
 }
 
 do_install_ptest() {
-    install -Dm0755 -t ${D}${PTEST_PATH}/tests/ ${B}/test/.libs/*
+    mkdir -p ${D}${PTEST_PATH}/tests
+    install -m 0755 -t ${D}${PTEST_PATH}/tests/ ${B}/test/.libs/*
 }