Remove trailing whitespace from examples Makefile

Summary:
The Makefile in the examples directory contained an empty line contain a tab character. This made my Emacs ask on every save `Suspicious line 10. Save anyway? (y or n)`
Closes https://github.com/facebook/rocksdb/pull/1872

Differential Revision: D4573881

Pulled By: siying

fbshipit-source-id: fb3b4ee

examples/Makefile

@@ -7,7 +7,7 @@ ifndef DISABLE_JEMALLOC
 	EXEC_LDFLAGS := $(JEMALLOC_LIB) $(EXEC_LDFLAGS) -lpthread
 	PLATFORM_CXXFLAGS += $(JEMALLOC_INCLUDE)
 endif
-	
+
 .PHONY: clean librocksdb
 
 all: simple_example column_families_example compact_files_example c_simple_example optimistic_transaction_example transaction_example compaction_filter_example options_file_example