pwlib needs porting for aarch64

pwlib (dependency of openh323) is not recognizing the aarch64 architecture as a 64 bit platform and fails compilation then later on.

I've developed the following patch for 1.11

--- configure.ac
+++ configure.ac
@@ -141,6 +141,11 @@
                    LIB64=1 ;
                   ;;

+ aarch64) MACHTYPE=aarch64 ;
+ P_64BIT=1 ;
+ LIB64=1 ;
+ ;;
+
    alpha | alphaev56 | alphaev6 | alphaev67 | alphaev7) MACHTYPE=alpha ;
                   P_64BIT=1 ;
                   ;;
--- make/unix.mak
+++ make/unix.mak
@@ -277,6 +277,10 @@
 endif
 endif

+ifneq (,$(findstring aarch64, $(MACHTYPE)))
+MACHTYPE := aarch64
+endif
+
 ifneq (,$(findstring powerpc, $(MACHTYPE)))
 MACHTYPE := ppc
 endif
@@ -435,6 +439,10 @@
 LDLIBS += -lresolv
 endif

+ifeq ($(MACHTYPE),aarch64)
+STDCCFLAGS += -DP_64BIT
+endif
+
 ifeq ($(MACHTYPE),ppc64)
 STDCCFLAGS += -DP_64BIT
 endif