tools/bc: update to 1.07

Update to latest version. Replace mirror with @GNU/bc.

Manually refresh:
- 001-no_doc.patch

Add patch found here:
26f275502d
as 002-fix-libmath.patch to fix compilation.

Add another patch found here:
55b26eda94
as 003-bc-fix-hang.patch to prevent a hang when building the kernel.

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

tools/bc/patches/002-fix-libmath.patch

@@ -0,0 +1,32 @@
+--- a/bc/fix-libmath_h
++++ b/bc/fix-libmath_h
+@@ -1,9 +1,9 @@
+-ed libmath.h <<EOS-EOS
+-1,1s/^/{"/
+-1,\$s/\$/",/
+-2,\$s/^/"/
+-\$,\$d
+-\$,\$s/,\$/,0}/
+-w
+-q
+-EOS-EOS
++#! /bin/bash
++sed -e '1   s/^/{"/' \
++    -e     's/$/",/' \
++    -e '2,$ s/^/"/'  \
++    -e   '$ d'       \
++    -i libmath.h
++
++sed -e '$ s/$/0}/' \
++    -i libmath.h
+--- a/configure
++++ b/configure
+@@ -5288,7 +5288,7 @@ case $bcle-$bcrl-$LEX in
+    ?-?-flex)
+ 	LEX="flex -I -8" ;;
+    ?-y-*)
+-	as_fn_error $? "readline works only with flex." "$LINENO" 5 ;;
++	: ;; # as_fn_error $? "readline works only with flex." "$LINENO" 5 ;;
+ esac
+ 
+ case $LEX-`uname -s` in