package/libopenssl do not build in parallel

With highly parallel builds on a heavily loaded machine, the libopenssl
build often (about half of the time) fails with spurious missing rules
in its Makefile:

    >>> host-libopenssl 3.4.1 Installing to host directory
    [...] /usr/bin/make  -C [...]/build/host-libopenssl-3.4.1 install
    "/usr/bin/make" depend && "/usr/bin/make" _build_libs
    "/usr/bin/make" depend && "/usr/bin/make" _build_modules
    "/usr/bin/make" depend && "/usr/bin/make" _build_programs
    [...]
    make[3]: *** No rule to make target '_build_modules'.  Stop.
    make[2]: *** [Makefile:3159: build_modules] Error 2
    make[2]: *** Waiting for unfinished jobs....
    make[3]: Nothing to be done for '_build_programs'.
    make[3]: Nothing to be done for '_build_libs'.
    make[1]: *** [package/pkg-generic.mk:283: [...]/build/host-libopenssl-3.4.1/.stamp_host_installed] Error 2
    make[1]: *** Waiting for unfinished jobs....
    [...]
    make: *** [Makefile:23: _all] Error 2

Ideally, we'd like to fix the issue. However, the Nakefile is generated
by the Configure script, written in perl, from the template in
Configurations/unix-Makefile.tmpl, which also uses some kind of special
(perl-related, probably) templating language. That makes it pretty
difficult to see what is going on, though, and nigh impossible to fix
without a deep understanding of the openssl buildsystem.

So, we can only disable parallel builds until the issue is fixed
upstream [0]. Add a comment to both build commands (host and target) to
reference the upstream issue report.

Note that the issue has mostly been observed in the build of the host
variant so far, but there is no reason why it can't happen in the build
of the target variant.

[0] https://github.com/openssl/openssl/issues/27074

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libopenssl/libopenssl.mk

@@ -132,24 +132,26 @@ endef
 LIBOPENSSL_POST_CONFIGURE_HOOKS += LIBOPENSSL_FIXUP_STATIC_MAKEFILE
 endif
 
+# Parallel build broken: https://github.com/openssl/openssl/issues/27074
 define HOST_LIBOPENSSL_BUILD_CMDS
-	$(HOST_MAKE_ENV) $(MAKE) -C $(@D)
+	$(HOST_MAKE_ENV) $(MAKE1) -C $(@D)
 endef
 
+# Parallel build broken: https://github.com/openssl/openssl/issues/27074
 define LIBOPENSSL_BUILD_CMDS
-	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D)
+	$(TARGET_MAKE_ENV) $(MAKE1) -C $(@D)
 endef
 
 define LIBOPENSSL_INSTALL_STAGING_CMDS
-	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) DESTDIR=$(STAGING_DIR) install
+	$(TARGET_MAKE_ENV) $(MAKE1) -C $(@D) DESTDIR=$(STAGING_DIR) install
 endef
 
 define HOST_LIBOPENSSL_INSTALL_CMDS
-	$(HOST_MAKE_ENV) $(MAKE) -C $(@D) install
+	$(HOST_MAKE_ENV) $(MAKE1) -C $(@D) install
 endef
 
 define LIBOPENSSL_INSTALL_TARGET_CMDS
-	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) DESTDIR=$(TARGET_DIR) install
+	$(TARGET_MAKE_ENV) $(MAKE1) -C $(@D) DESTDIR=$(TARGET_DIR) install
 	$(RM) -rf $(TARGET_DIR)/usr/lib/ssl
 	$(RM) -f $(TARGET_DIR)/usr/bin/c_rehash
 endef