gflags: add runtime dependency on bash

* add runtime dependency on bash to fix QA issue:
| ERROR: gflags-2.2.0-r0 do_package_qa: QA Issue:
| /usr/bin/gflags_completions.sh contained in package
| gflags-bash-completion requires /bin/bash, but
|  no providers found in RDEPENDS_gflags-bash-completion? [file-rdeps]
Signed-off-by: Jackie Huang <jackie.huang@windriver.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
(cherry picked from commit 8530df3f

)
Signed-off-by: Armin Kuster <akuster808@gmail.com>

meta-oe/recipes-support/gflags/gflags_2.2.0.bb

@@ -18,4 +18,4 @@ EXTRA_OECMAKE="-DBUILD_SHARED_LIBS=ON -DREGISTER_INSTALL_PREFIX=OFF -DLIB_INSTAL
 
 PACKAGES =+ "${PN}-bash-completion"
 FILES_${PN}-bash-completion += "${bindir}/gflags_completions.sh"
-RDEPENDS_${PN}-bash-completion = "bash-completion"
+RDEPENDS_${PN}-bash-completion = "bash bash-completion"