[ 49/75] kbuild: fix make headers_check with make 3.80

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3.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sam Ravnborg <sam@xxxxxxxxxxxx>

commit c4619bc6fa5149a6ab39be845a39142b6a996ea5 upstream.

Commit 10b63956 ("UAPI: Plumb the UAPI Kbuilds into the user header
installation and checking") introduced a dependency of make 3.81
due to use of $(or ...)

We do not want to lift the requirement to gmake 3.81 just yet...
Included are a straightforward conversion to $(if ...)

Bisected-and-tested-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Signed-off-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
Signed-off-by: Michal Marek <mmarek@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 scripts/Makefile.headersinst |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

--- a/scripts/Makefile.headersinst
+++ b/scripts/Makefile.headersinst
@@ -8,7 +8,7 @@
 # ==========================================================================
 
 # called may set destination dir (when installing to asm/)
-_dst := $(or $(destination-y),$(dst),$(obj))
+_dst := $(if $(destination-y),$(destination-y),$(if $(dst),$(dst),$(obj)))
 
 # generated header directory
 gen := $(if $(gen),$(gen),$(subst include/,include/generated/,$(obj)))
@@ -48,13 +48,14 @@ all-files     := $(header-y) $(genhdr-y)
 output-files  := $(addprefix $(installdir)/, $(all-files))
 
 input-files   := $(foreach hdr, $(header-y), \
-		   $(or \
+		   $(if $(wildcard $(srcdir)/$(hdr)), \
 			$(wildcard $(srcdir)/$(hdr)), \
-			$(wildcard $(oldsrcdir)/$(hdr)), \
-			$(error Missing UAPI file $(srcdir)/$(hdr)) \
+			$(if $(wildcard $(oldsrcdir)/$(hdr)), \
+				$(wildcard $(oldsrcdir)/$(hdr)), \
+				$(error Missing UAPI file $(srcdir)/$(hdr))) \
 		   )) \
 		 $(foreach hdr, $(genhdr-y), \
-		   $(or \
+		   $(if	$(wildcard $(gendir)/$(hdr)), \
 			$(wildcard $(gendir)/$(hdr)), \
 			$(error Missing generated UAPI file $(gendir)/$(hdr)) \
 		   ))


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