use sed in Makefile instead of patches and opatch

Makefile

@@ -91,19 +91,21 @@ $(TOOLDIR_FINAL)/$(MAKECONF_TARGET_ARCH)-solo5-ocaml-%: \
 toolchains: $(TOOLCHAIN_FOR_BUILD) $(TOOLCHAIN_FINAL)
 
 # OCAML
-# Extract sources from the ocaml-src package and apply patches if there any in
-# `patches/<OCaml version>/`
+# Extract sources from the ocaml-src package
 ocaml:
 # First make sure the ocaml directory doesn't exist, otherwise the cp would
 # create an ocaml-src subdirectory
 	test ! -d $@
 	cp -r "$$(ocamlfind query ocaml-src)" $@
-	VERSION="$$(head -n1 ocaml/VERSION | cut -d '.' -f 1-2)" ; \
-	if test -d "patches/$$VERSION" ; then \
-	  opatch -v -C $@ "patches/$$VERSION"/*; \
-	fi
 
 ocaml/Makefile.config: $(LIBS) $(TOOLCHAIN_FOR_BUILD) | ocaml
+	sed -e 's/#define Max_domains_def 128/#define Max_domains_def 1/' ocaml/runtime/caml/domain.h > ocaml/runtime/caml/domain.h.sed && \
+		mv ocaml/runtime/caml/domain.h.sed ocaml/runtime/caml/domain.h
+	sed -e 's/#define Max_domains_max 4096/#define Max_domains_max 1/' ocaml/runtime/caml/domain.h > ocaml/runtime/caml/domain.h.sed && \
+		mv ocaml/runtime/caml/domain.h.sed ocaml/runtime/caml/domain.h
+	sed -e 's/ostype="None"/ostype="$$(ocamlc -config-var os_type)"/' ocaml/configure > ocaml/configure.sed && \
+		mv ocaml/configure.sed ocaml/configure
+	chmod +x ocaml/configure
 	PATH="$$PWD/$(TOOLDIR_FOR_BUILD):$$PATH" ; \
 	cd ocaml && \
 	  ./configure \

ocaml-solo5-cross-aarch64.opam

@@ -28,10 +28,9 @@ run-test: [
   [make "test"]
 ]
 depends: [
-  "opatch" {build} # to patch the compiler sources
   "ocamlfind" {build}
   "ocaml-src" {build}
-  "ocaml" {>= "5.5.2" & < "5.6"}
+  "ocaml" {>= "5.5" & < "5.6"}
   "solo5" {>= "0.9.1"}
   "solo5-cross-aarch64" {>= "0.9.1" }
 ]

ocaml-solo5.opam

@@ -28,10 +28,9 @@ run-test: [
   [make "test"]
 ]
 depends: [
-  "opatch" {build} # to patch the compiler sources
   "ocamlfind" {build}
   "ocaml-src" {build}
-  "ocaml" {>= "5.5.2" & < "5.6"}
+  "ocaml" {>= "5.5" & < "5.6"}
   "solo5" {>= "0.9.1"}
 ]
 conflicts: [