修复在release编译模式下，pagehack编译报错

contrib/pagehack/Makefile

@@ -7,6 +7,9 @@ OBJS		= pagehack.o \
 PROGRAM = pagehack
 all: submake-pagecompression
 
+exclude_option = -fPIC
+override CPPFLAGS := $(filter-out $(exclude_option),$(CPPFLAGS))
+
 ifdef USE_PGXS
 PG_CONFIG = pg_config
 PGXS := $(shell $(PG_CONFIG) --pgxs)

contrib/pagehack/pagehack.cpp

@@ -198,7 +198,11 @@ static int PgIndexRelTupleParserCursor = -1;
 
 
 /* For Assert(...) macros. */
+#ifdef USE_ASSERT_CHECKING
 THR_LOCAL bool assert_enabled = true;
+#else
+THR_LOCAL bool assert_enabled = false;
+#endif
 
 /* Options */
 bool only_vm = false;