Remove unused libgcrypt dependency

cmake_targets/tools/MODULES/FindGcrypt.cmake

-# - Find gnutls
-# Find the native GCRYPT includes and library
-#
-#  GCRYPT_FOUND - True if gnutls found.
-#  GCRYPT_INCLUDE_DIR - where to find gnutls.h, etc.
-#  GCRYPT_LIBRARIES - List of libraries when using gnutls.
-
-if (GCRYPT_INCLUDE_DIR AND GCRYPT_LIBRARIES)
-  set(GCRYPT_FIND_QUIETLY TRUE)
-endif (GCRYPT_INCLUDE_DIR AND GCRYPT_LIBRARIES)
-
-# Include dir
-find_path(GCRYPT_INCLUDE_DIR
-	NAMES
-	  gcrypt.h
-)
-
-# Library
-find_library(GCRYPT_LIBRARY 
-  NAMES gcrypt
-)
-
-# handle the QUIETLY and REQUIRED arguments and set GCRYPT_FOUND to TRUE if 
-# all listed variables are TRUE
-INCLUDE(FindPackageHandleStandardArgs)
-FIND_PACKAGE_HANDLE_STANDARD_ARGS(GCRYPT DEFAULT_MSG GCRYPT_LIBRARY GCRYPT_INCLUDE_DIR)
-
-IF(GCRYPT_FOUND)
-  SET( GCRYPT_LIBRARIES ${GCRYPT_LIBRARY} )
-ELSE(GCRYPT_FOUND)
-  SET( GCRYPT_LIBRARIES )
-ENDIF(GCRYPT_FOUND)
-
-# Lastly make it so that the GCRYPT_LIBRARY and GCRYPT_INCLUDE_DIR variables
-# only show up under the advanced options in the gui cmake applications.
-MARK_AS_ADVANCED( GCRYPT_LIBRARY GCRYPT_INCLUDE_DIR )

cmake_targets/tools/build_helper

@@ -595,7 +595,7 @@ check_install_oai_software() {
     case "$(get_distribution_release)" in
         "ubuntu18.04")
             add_cmake_repo
-            specific_packages="libgcrypt11-dev"
+            specific_packages=""
             ;;
          "debian11")
             specific_packages="libz-dev"
@@ -645,7 +645,6 @@ check_install_oai_software() {
       pkgconfig \
       libconfig-devel \
       libffi-devel \
-      libgcrypt-devel \
       lksctp-tools \
       lksctp-tools-devel \
       libtool \