Merge bitcoin#17066: build: Remove workaround for ancient libtool

30fc1a3 build: Remove workaround for ancient libtool (Hennadii Stepanov)
6ca01b9 build: Ensure a minimal version of libtool (Hennadii Stepanov)

Pull request description:

  Since libtool 1.5.2, on Linux libtool no longer sets RPATH for any directories in the dynamic linker search path, so there is no longer an issue.

  This commit reverts a98356f.

  Refs:
  - https://wiki.debian.org/RpathIssue
  - [Debian jessie has libtool 2.4.2](https://packages.debian.org/jessie/libtool)

ACKs for top commit:
  laanwj:
    ACK 30fc1a3

Tree-SHA512: fab56265d4d2c96216a353cc076c6f510e15748d8134f97bae2f67b6d8c0b6a1a9f362d2ab23b19ccc3a8bba8eac3bb1668fc3e42037590f63a7ab4819c9ee15

Author: laanwj

configure.ac

@@ -86,6 +86,10 @@ fi
 AC_PROG_OBJCXX
 ])
 
+dnl Since libtool 1.5.2 (released 2004-01-25), on Linux libtool no longer
+dnl sets RPATH for any directories in the dynamic linker search path.
+dnl See more: https://wiki.debian.org/RpathIssue
+LT_PREREQ([1.5.2])
 dnl Libtool init checks.
 LT_INIT([pic-only])
 
@@ -1733,17 +1737,6 @@ AC_CONFIG_SUBDIRS([src/secp256k1])
 
 AC_OUTPUT
 
-dnl Taken from https://wiki.debian.org/RpathIssue
-case $host in
-   *-*-linux-gnu)
-     AC_MSG_RESULT([Fixing libtool for -rpath problems.])
-     sed < libtool > libtool-2 \
-     's/^hardcode_libdir_flag_spec.*$'/'hardcode_libdir_flag_spec=" -D__LIBTOOL_IS_A_FOOL__ "/'
-     mv libtool-2 libtool
-     chmod 755 libtool
-   ;;
-esac
-
 dnl Replace the BUILDDIR path with the correct Windows path if compiling on Native Windows
 case ${OS} in
    *Windows*)