tools/mpfr: update to 4.1.1

Changes:
- Bug fixes
- Improved manual formatting

Refresh patches:
- 001-only_src.patch

Import patch fixing macro bug:
- 002-Fix-mpfr_custom_get_kind-macro-bug.patch

Signed-off-by: Nick Hainke <vincent@systemli.org>

tools/mpfr/patches/001-only_src.patch

@@ -1,6 +1,6 @@
 --- a/Makefile.am
 +++ b/Makefile.am
-@@ -24,7 +24,7 @@ AUTOMAKE_OPTIONS = gnu
+@@ -34,7 +34,7 @@ AUTOMAKE_OPTIONS = gnu
  # old Automake version.
  ACLOCAL_AMFLAGS = -I m4
  
@@ -11,7 +11,7 @@
  pkgconfig_DATA = mpfr.pc
 --- a/Makefile.in
 +++ b/Makefile.in
-@@ -384,7 +384,7 @@ AUTOMAKE_OPTIONS = gnu
+@@ -397,7 +397,7 @@ AUTOMAKE_OPTIONS = gnu
  # libtoolize and in case some developer needs to switch back to an
  # old Automake version.
  ACLOCAL_AMFLAGS = -I m4