Makefile: strip leading ./ in $(LIB_H)

Currently, $(LIB_H) is generated from two modes: if `git ls-files` is
present, it will use that to enumerate the files in the repository; else
it will use `$(FIND) .` to enumerate the files in the directory.

There is a subtle difference between these two methods, however. With
ls-files, filenames don't have a leading `./` while with $(FIND), they
do. This results in $(CHK_HDRS) having to substitute out the leading
`./` before it uses $(LIB_H).

Unify the two possible values in $(LIB_H) by using patsubst to remove the
`./` prefix at its definition.

Signed-off-by: Denton Liu <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: Denton-L

Makefile

@@ -818,12 +818,12 @@ VCSSVN_LIB = vcs-svn/lib.a
 
 GENERATED_H += command-list.h
 
-LIB_H := $(sort $(shell git ls-files '*.h' ':!t/' ':!Documentation/' 2>/dev/null || \
+LIB_H := $(sort $(patsubst ./%,%,$(shell git ls-files '*.h' ':!t/' ':!Documentation/' 2>/dev/null || \
 	$(FIND) . \
 	-name .git -prune -o \
 	-name t -prune -o \
 	-name Documentation -prune -o \
-	-name '*.h' -print))
+	-name '*.h' -print)))
 
 LIB_OBJS += abspath.o
 LIB_OBJS += advice.o
@@ -2768,7 +2768,7 @@ EXCEPT_HDRS := $(GEN_HDRS) compat/% xdiff/%
 ifndef GCRYPT_SHA256
 	EXCEPT_HDRS += sha256/gcrypt.h
 endif
-CHK_HDRS = $(filter-out $(EXCEPT_HDRS),$(patsubst ./%,%,$(LIB_H)))
+CHK_HDRS = $(filter-out $(EXCEPT_HDRS),$(LIB_H))
 HCO = $(patsubst %.h,%.hco,$(CHK_HDRS))
 
 $(HCO): %.hco: %.h FORCE