Remove pkcs11-helper option

In preparation for removing X.509 and PKCS11 from Mbed Crypto, remove
pkcs11-helper. It won't be relevant after X.509 and PKCS11 are removed.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index feca4ab..ec95d9a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -5,7 +5,6 @@
     project("mbed TLS" C)
 endif()
 
-option(USE_PKCS11_HELPER_LIBRARY "Build mbed TLS with the pkcs11-helper library." OFF)
 option(ENABLE_ZLIB_SUPPORT "Build mbed TLS with zlib library." OFF)
 
 option(ENABLE_PROGRAMS "Build mbed TLS programs." ON)
diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
index 9039216..9e4a90a 100644
--- a/library/CMakeLists.txt
+++ b/library/CMakeLists.txt
@@ -123,10 +123,6 @@
     set(libs ${libs} network)
 endif(HAIKU)
 
-if(USE_PKCS11_HELPER_LIBRARY)
-    set(libs ${libs} pkcs11-helper)
-endif(USE_PKCS11_HELPER_LIBRARY)
-
 if(ENABLE_ZLIB_SUPPORT)
     set(libs ${libs} ${ZLIB_LIBRARIES})
 endif(ENABLE_ZLIB_SUPPORT)
diff --git a/programs/Makefile b/programs/Makefile
index 4f913bb..407a9a2 100644
--- a/programs/Makefile
+++ b/programs/Makefile
@@ -1,6 +1,5 @@
 
 # To compile on SunOS: add "-lsocket -lnsl" to LDFLAGS
-# To compile with PKCS11: add "-lpkcs11-helper" to LDFLAGS
 
 CFLAGS	?= -O2
 WARNING_CFLAGS ?= -Wall -W -Wdeclaration-after-statement
diff --git a/programs/test/CMakeLists.txt b/programs/test/CMakeLists.txt
index 64ed379..0d2b946 100644
--- a/programs/test/CMakeLists.txt
+++ b/programs/test/CMakeLists.txt
@@ -2,10 +2,6 @@
     mbedtls
 )
 
-if(USE_PKCS11_HELPER_LIBRARY)
-    set(libs ${libs} pkcs11-helper)
-endif(USE_PKCS11_HELPER_LIBRARY)
-
 if(ENABLE_ZLIB_SUPPORT)
     set(libs ${libs} ${ZLIB_LIBRARIES})
 endif(ENABLE_ZLIB_SUPPORT)
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index fd02964..1cfbd25 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -2,10 +2,6 @@
     mbedtls
 )
 
-if(USE_PKCS11_HELPER_LIBRARY)
-    set(libs ${libs} pkcs11-helper)
-endif(USE_PKCS11_HELPER_LIBRARY)
-
 if(ENABLE_ZLIB_SUPPORT)
     set(libs ${libs} ${ZLIB_LIBRARIES})
 endif(ENABLE_ZLIB_SUPPORT)
diff --git a/tests/Makefile b/tests/Makefile
index 8db7920..96c3d64 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -1,6 +1,5 @@
 
 # To compile on SunOS: add "-lsocket -lnsl" to LDFLAGS
-# To compile with PKCS11: add "-lpkcs11-helper" to LDFLAGS
 
 CFLAGS	?= -O2
 WARNING_CFLAGS ?= -Wall -W -Wdeclaration-after-statement -Wno-unused-function -Wno-unused-value