gdb/configure.ac: remove elf_hp.h check

The comment says this is for HP/UX, which is no longer supported.  There
should be no functional changes with this, since nothing checks
HAVE_ELF_HP_H.

Change-Id: Ie897fc64638c9fea28463e1bf69e450c3673fd84

gdb/config.in

diff --git a/gdb/config.in b/gdb/config.in
index 59a5da3..187b42c 100644
--- a/gdb/config.in
+++ b/gdb/config.in
@@ -181,9 +181,6 @@
 /* Define if <sys/procfs.h> has elf_fpregset_t. */
 #undef HAVE_ELF_FPREGSET_T
 
-/* Define to 1 if you have the <elf_hp.h> header file. */
-#undef HAVE_ELF_HP_H
-
 /* Define to 1 if your system has the etext variable. */
 #undef HAVE_ETEXT
 

gdb/configure

diff --git a/gdb/configure b/gdb/configure
index 4c498a8..138c2a1 100755
--- a/gdb/configure
+++ b/gdb/configure
@@ -29187,9 +29187,7 @@
 
 fi
 
-# elf_hp.h is for HP/UX 64-bit shared library support.
 for ac_header in  \
-  elf_hp.h \
   machine/reg.h \
   nlist.h \
   ptrace.h \

gdb/configure.ac

diff --git a/gdb/configure.ac b/gdb/configure.ac
index 72e0e56..d638b8f 100644
--- a/gdb/configure.ac
+++ b/gdb/configure.ac
@@ -1294,9 +1294,7 @@
 # ------------------------- #
 
 AC_HEADER_STDC
-# elf_hp.h is for HP/UX 64-bit shared library support.
 AC_CHECK_HEADERS([ \
-  elf_hp.h \
   machine/reg.h \
   nlist.h \
   ptrace.h \