MINOR: initcall: Rename __GLOBL and __GLOBL1.

Rename __GLOBL and __GLOBL1 to __HA_GLOBL and __HA_GLOBL1, as the former are
already defined on FreeBSD.

This should be backported to 2.4, 2.3 and 2.2.

(cherry picked from commit e972c0acde990de30a00f76f7f61470d3325c757)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
diff --git a/include/haproxy/initcall.h b/include/haproxy/initcall.h
index 5687130..50dedb7 100644
--- a/include/haproxy/initcall.h
+++ b/include/haproxy/initcall.h
@@ -96,11 +96,11 @@
  * as a pointer (args are cast to (void*)). Do not use this macro directly,
  * use INITCALL{0..3}() instead.
  */
-#define __GLOBL1(sym)   __asm__(".globl " #sym)
-#define __GLOBL(sym)    __GLOBL1(sym)
+#define __HA_GLOBL1(sym)   __asm__(".globl " #sym)
+#define __HA_GLOBL(sym)    __HA_GLOBL1(sym)
 #define __DECLARE_INITCALL(stg, linenum, function, a1, a2, a3)     \
-        __GLOBL(__start_i_##stg );                                 \
-        __GLOBL(__stop_i_##stg );                                  \
+        __HA_GLOBL(__start_i_##stg );                              \
+        __HA_GLOBL(__stop_i_##stg );                               \
 	static const struct initcall *__initcb_##linenum           \
 	    __attribute__((__used__)) HA_INIT_SECTION(stg) =	   \
 	        (stg < STG_SIZE) ? &(const struct initcall) {      \