remove extraneous space after -L flag.

src/interfaces/ecpg/test/Makefile.regress

 override CPPFLAGS := -I$(srcdir)/../../include -I$(libpq_srcdir) $(CPPFLAGS) 
 override CFLAGS += $(PTHREAD_CFLAGS) -I$(srcdir)/../../include -I$(libpq_srcdir) -I../../include -I$(top_builddir)/src/include
-override LDFLAGS += -L../../ecpglib -L ../../pgtypeslib -L../../../libpq
+override LDFLAGS += -L../../ecpglib -L../../pgtypeslib -L../../../libpq
 override LIBS += -lpgtypes -lecpg -lpq
 
 ECPG = ../../preproc/ecpg -I$(srcdir)/../../include