[Buildroot] [git commit branch/2021.08.x] support/dependencies: avoid spurious warning on print-vars

commit: https://git.buildroot.net/buildroot/commit/?id=c63dcc457969c1dce18a0fd06ac358fae1883703
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2021.08.x

When calling 'printvars', the 'suitable-host-package' macro is printed
(a macro is just a variable like the others, after all, just with some
parameters). Because it is printed as a variable, it is missing its
parameters, but it still tries to evaluate the $(shell) construct.

This causes spurious warning:

    make[1]: support/dependencies/check-host-.sh: Command not found

Only try and call the script if there is actually a tool to check for.

Signed-off-by: Yann E. MORIN <redacted>
(cherry picked from commit 77304e5143bf77e9fd2f8125807bbf9665cda8bc)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
---
 support/dependencies/dependencies.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/support/dependencies/dependencies.mk b/support/dependencies/dependencies.mk
index 4fac5c731b..a7bb1a6080 100644
--- a/support/dependencies/dependencies.mk
+++ b/support/dependencies/dependencies.mk

@@ -15,7 +15,7 @@ else
 # script should use 'which' to find a candidate. The script should return
 # the path to the suitable host tool, or nothing if no suitable tool was found.
 define suitable-host-package
-$(shell support/dependencies/check-host-$(1).sh $(2))
+$(if $(1),$(shell support/dependencies/check-host-$(1).sh $(2)))
 endef
 endif
 # host utilities needs host-tar to extract the source code tarballs, so

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