BUILD: debug: remove unnecessary quotes in HA_WEAK() calls

HA_WEAK() is supposed to take a symbol in argument, not a string, since
the asm statements it produces already quote the argument. Having it
quoted twice doesn't work on older compilers and was the only reason
why DEBUG_MEM_STATS didn't work on older compilers.
diff --git a/include/haproxy/bug.h b/include/haproxy/bug.h
index 54b41ee..54536ff 100644
--- a/include/haproxy/bug.h
+++ b/include/haproxy/bug.h
@@ -273,8 +273,8 @@
 			.func = __func__,				\
 		},							\
 	};								\
-	HA_WEAK("__start_mem_stats");					\
-	HA_WEAK("__stop_mem_stats");					\
+	HA_WEAK(__start_mem_stats);					\
+	HA_WEAK(__stop_mem_stats);					\
 	_HA_ATOMIC_INC(&_.calls);					\
 	_HA_ATOMIC_ADD(&_.size, __x * __y);				\
 	calloc(__x,__y);						\
@@ -296,8 +296,8 @@
 			.func = __func__,				\
 		},							\
 	};								\
-	HA_WEAK("__start_mem_stats");					\
-	HA_WEAK("__stop_mem_stats");					\
+	HA_WEAK(__start_mem_stats);					\
+	HA_WEAK(__stop_mem_stats);					\
 	if (__x) {							\
 		_HA_ATOMIC_INC(&_.calls);				\
 		_HA_ATOMIC_ADD(&_.size, __y);				\
@@ -314,8 +314,8 @@
 			.func = __func__,				\
 		},							\
 	};								\
-	HA_WEAK("__start_mem_stats");					\
-	HA_WEAK("__stop_mem_stats");					\
+	HA_WEAK(__start_mem_stats);					\
+	HA_WEAK(__stop_mem_stats);					\
 	if (__builtin_constant_p((x)) || __builtin_constant_p(*(x))) {  \
 		HA_LINK_ERROR(call_to_ha_free_attempts_to_free_a_constant); \
 	}								\
@@ -335,8 +335,8 @@
 			.func = __func__,				\
 		},							\
 	};								\
-	HA_WEAK("__start_mem_stats");					\
-	HA_WEAK("__stop_mem_stats");					\
+	HA_WEAK(__start_mem_stats);					\
+	HA_WEAK(__stop_mem_stats);					\
 	_HA_ATOMIC_INC(&_.calls);					\
 	_HA_ATOMIC_ADD(&_.size, __x);					\
 	malloc(__x);							\
@@ -352,8 +352,8 @@
 			.func = __func__,				\
 		},							\
 	};								\
-	HA_WEAK("__start_mem_stats");					\
-	HA_WEAK("__stop_mem_stats");					\
+	HA_WEAK(__start_mem_stats);					\
+	HA_WEAK(__stop_mem_stats);					\
 	_HA_ATOMIC_INC(&_.calls);					\
 	_HA_ATOMIC_ADD(&_.size, __y);					\
 	realloc(__x,__y);						\
@@ -369,8 +369,8 @@
 			.func = __func__,				\
 		},							\
 	};								\
-	HA_WEAK("__start_mem_stats");					\
-	HA_WEAK("__stop_mem_stats");					\
+	HA_WEAK(__start_mem_stats);					\
+	HA_WEAK(__stop_mem_stats);					\
 	_HA_ATOMIC_INC(&_.calls);					\
 	_HA_ATOMIC_ADD(&_.size, __y);					\
 	strdup(__x);							\
diff --git a/include/haproxy/pool.h b/include/haproxy/pool.h
index 1af32ae..8fd14b9 100644
--- a/include/haproxy/pool.h
+++ b/include/haproxy/pool.h
@@ -263,8 +263,8 @@
 		},							\
 	};								\
 	_.extra = __pool;						\
-	HA_WEAK("__start_mem_stats");					\
-	HA_WEAK("__stop_mem_stats");					\
+	HA_WEAK(__start_mem_stats);					\
+	HA_WEAK(__stop_mem_stats);					\
 	if (__ptr)  {							\
 		_HA_ATOMIC_INC(&_.calls);				\
 		_HA_ATOMIC_ADD(&_.size, __pool->size);			\
@@ -283,8 +283,8 @@
 		},							\
 	};								\
 	_.extra = __pool;						\
-	HA_WEAK("__start_mem_stats");					\
-	HA_WEAK("__stop_mem_stats");					\
+	HA_WEAK(__start_mem_stats);					\
+	HA_WEAK(__stop_mem_stats);					\
 	_HA_ATOMIC_INC(&_.calls);					\
 	_HA_ATOMIC_ADD(&_.size, __x);					\
 	__pool_alloc(__pool, 0);					\
@@ -301,8 +301,8 @@
 		},							\
 	};								\
 	_.extra = __pool;						\
-	HA_WEAK("__start_mem_stats");					\
-	HA_WEAK("__stop_mem_stats");					\
+	HA_WEAK(__start_mem_stats);					\
+	HA_WEAK(__stop_mem_stats);					\
 	_HA_ATOMIC_INC(&_.calls);					\
 	_HA_ATOMIC_ADD(&_.size, __x);					\
 	__pool_alloc(__pool, POOL_F_MUST_ZERO);				\