package/unifdef: add new package

A small package that does "Selectively remove C preprocessor conditionals".

The package will be needed for the upcoming webkitgtk 2.40.0 release.
I personally added it to get started with 2.39.2.

See: https://github.com/WebKit/WebKit/commit/f76a7e30e5749af897b83cc75b2534b1afa32552
Signed-off-by: Thomas Devoogdt <thomas.devoogdt@barco.com>
[Peter: use prefix=]
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/unifdef/0001-Makefile-fix-error-on-install.patch

@@ -0,0 +1,31 @@
+From b5e4229918c13bc0c11a523105cdb3a464337b37 Mon Sep 17 00:00:00 2001
+From: Thomas Devoogdt <thomas.devoogdt@barco.com>
+Date: Mon, 12 Dec 2022 12:59:59 +0100
+Subject: [PATCH] Makefile: fix error on install
+
+ln: failed to create symbolic link '/home/thomas/Documents/buildroot/output/host/share/man/man1/unifdefall.1': File exists
+
+Seen while trying to add this package to buildroot.org.
+
+(upstream: https://github.com/fanf2/unifdef/pull/16)
+Signed-off-by: Thomas Devoogdt <thomas.devoogdt@barco.com>
+---
+ Makefile | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/Makefile b/Makefile
+index 36c7028..485927a 100644
+--- a/Makefile
++++ b/Makefile
+@@ -28,7 +28,7 @@ install: unifdef unifdefall.sh unifdef.1
+ 	: manual
+ 	install -m 755 -d  ${man1dest}
+ 	install -m 644 unifdef.1  ${man1dest}/
+-	ln -s unifdef.1  ${man1dest}/unifdefall.1
++	ln -f -s unifdef.1  ${man1dest}/unifdefall.1
+ 
+ clean:
+ 	rm -f unifdef version.h
+-- 
+2.38.1
+

package/unifdef/unifdef.hash

@@ -0,0 +1,3 @@
+# Locally computed
+sha256  fba564a24db7b97ebe9329713ac970627b902e5e9e8b14e19e024eb6e278d10b  unifdef-2.12.tar.gz
+sha256  37ed46a39446b15b08af418fda23b75c27a769d5aad236d817ee7522cc9caeee  COPYING

package/unifdef/unifdef.mk

@@ -0,0 +1,20 @@
+################################################################################
+#
+# unifdef
+#
+################################################################################
+
+UNIFDEF_VERSION = 2.12
+UNIFDEF_SITE = https://dotat.at/prog/unifdef
+UNIFDEF_LICENSE = BSD-2-Clause
+UNIFDEF_LICENSE_FILES = COPYING
+
+define HOST_UNIFDEF_BUILD_CMDS
+	$(HOST_CONFIGURE_OPTS) $(MAKE) -C $(@D)
+endef
+
+define HOST_UNIFDEF_INSTALL_CMDS
+	$(HOST_CONFIGURE_OPTS) $(MAKE) -C $(@D) prefix=$(HOST_DIR) install
+endef
+
+$(eval $(host-generic-package))