Improve ld flags for CMake itself on Linux/HPPA

Workaround binutils bug by only marking unique section starting by
".text._".

This adds the HPPA workaround improved in commit b22a0f15 (bootstrap:
improve ld flag for Linux/HPPA builds, 2014-01-14) not only to the
bootstrap, but also to the normal build.

CompileFlags.cmake

@@ -66,5 +66,5 @@ endif ()
 # 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_SYSTEM_NAME STREQUAL Linux AND CMAKE_SYSTEM_PROCESSOR STREQUAL parisc)
-  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--unique=.text.*")
+  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--unique=.text._*")
 endif ()