HPUX patches from Vladimir Turin.

src/include/port/hpux.h

 #define JMP_BUF
 #define USE_POSIX_TIME
+#define USE_POSIX_SIGNALS
 #define HAS_TEST_AND_SET
 typedef struct
 {

src/makefiles/Makefile.hpux

 HPUX_MAJOR= $(shell uname -r|sed 's/^[^.]*\.\([^.]*\).*/\1/')
 # HP-UX 10 has a select() in libcurses, so we need to get the libc version first
 ifeq ($(HPUX_MAJOR), 10)
-   LDFLAGS:= -lc $(LDFLAGS)
+   LDFLAGS:= -Wl,-E -lc $(LDFLAGS)
 endif
 
 # Does anyone use this stuff?