bootstrap: improve ld flag for Linux/HPPA builds

Follow up commit ca63bb10 (bootstrap: try better workaround for builds
on Linux/HPPA, 2013-09-12) with an improved ld flag.

Suggested-by: Guy Martin

bootstrap

@@ -739,10 +739,7 @@ if ${cmake_system_linux}; then
   # avoid binutils problem with large binaries, e.g. when building CMake in debug mode
   # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50230
   if ${cmake_machine_parisc}; then
-    # if -O[s23] is given the effect is inverted, so do not use the flag then
-    if [ "`echo "${CXXFLAGS}" | sed -r '/^(.* )?(-O[s234])( .*)?$/s/.*/-Os/'`" != "-Os" ]; then
-      cmake_ld_flags="${LDFLAGS} -Wl,--unique=.text.*"
-    fi
+    cmake_ld_flags="${LDFLAGS} -Wl,--unique=.text._*"
   fi
 fi