Merge pull request #4384 from pks-t/pks/rm-example-makefile

examples: remove Makefile

examples/.gitignore

-general
-showindex
-diff
-rev-list
-blame
-cat-file
-init
-log
-rev-parse
-remote
-status
-tag
-for-each-ref
-describe
-*.dSYM

examples/Makefile

-.PHONY: all
-
-CC = gcc
-CFLAGS = -g -I../include -I../src -Wall -Wextra -Wmissing-prototypes -Wno-missing-field-initializers
-LFLAGS = -L../build -lgit2 -lz
-APPS = general showindex diff rev-list cat-file status log rev-parse init blame tag remote
-APPS += for-each-ref
-APPS += describe
-
-all: $(APPS)
-
-% : %.c
-	$(CC) -o $@ common.c $(CFLAGS) $< $(LFLAGS)
-
-clean:
-	$(RM) $(APPS)
-	$(RM) -r *.dSYM