pkgdep/git: Call install_extra_pkgs() only on Linux distros

Change-Id: Ic93b83dab25957bd3d99527fccb9374f4f23d110
Signed-off-by: Michal Berger <michalx.berger@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/4184
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Reviewed-by: John Kariuki <John.K.Kariuki@intel.com>

test/common/config/pkgdep/git

@@ -349,6 +349,7 @@ else
 		install_flamegraph
 		install_qemu
 	)
+	install_extra_pkgs
 fi
 sources+=(install_fio)
 sources+=(install_vagrant)
@@ -356,8 +357,6 @@ sources+=(install_vagrant)
 sudo mkdir -p /usr/{,local}/src
 sudo mkdir -p "$GIT_REPOS"
 
-install_extra_pkgs
-
 if [[ $INSTALL_REFSPDK == true ]]; then
 	# Serialize builds as refspdk depends on spdk
 	install_spdk