Move heirloom lex and flex after musl, replace heirloom yacc with byacc

This way, heirloom-devtools is only linked to a libc with a CDDL-compatible
license, making it fully redistributable. Heirloom yacc doesn't work properly
with musl libc, but luckily byacc can do its job just fine, so we only need
heirloom lex now.

Thanks to the more complete libc, and bash being available, heirloom's
bootstrap is significantly simplified.

steps/manifest

@@ -50,7 +50,6 @@ build: sed-4.0.9
 build: bzip2-1.0.8
 build: coreutils-5.0
 build: byacc-20240109
-build: heirloom-devtools-070527
 build: bash-2.05b
 improve: setup_repo
 improve: update_env
@@ -58,7 +57,6 @@ improve: merged_usr
 improve: populate_device_nodes
 define: CONSOLES = ( INTERACTIVE == True && CHROOT == False )
 improve: open_console ( CONSOLES == True )
-build: flex-2.5.11
 build: tcc-0.9.27
 improve: musl_libdir
 build: musl-1.1.24
@@ -68,8 +66,10 @@ build: tcc-0.9.27
 build: sed-4.0.9
 build: bzip2-1.0.8
 build: m4-1.4.7
+build: heirloom-devtools-070527
+build: flex-2.5.11
 build: flex-2.6.4
-uninstall: /usr/bin/yacc
+uninstall: heirloom-devtools-070527
 build: bison-3.4.1
 build: bison-3.4.1
 build: bison-3.4.1