package/dhcpcd: add BR2_PACKAGE_DHCPCD_ENABLE_PRIVSEP

Add BR2_PACKAGE_DHCPCD_ENABLE_PRIVSEP following Arnout feedback:
https://patchwork.ozlabs.org/project/buildroot/patch/20210303091904.467706-1-fontaine.fabrice@gmail.com

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Reviewed-by: Joachim Wiberg <troglobit@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/dhcpcd/Config.in

@@ -8,3 +8,22 @@ config BR2_PACKAGE_DHCPCD
 	  An RFC2131 compliant DHCP client
 
 	  http://roy.marples.name/projects/dhcpcd/
+
+if BR2_PACKAGE_DHCPCD
+
+config BR2_PACKAGE_DHCPCD_ENABLE_PRIVSEP
+	bool
+	default y
+	depends on BR2_USE_MMU
+	# Audit headers were only added in recent kernels for some arches
+	depends on !(BR2_arceb || BR2_arcle) || \
+		BR2_TOOLCHAIN_HEADERS_AT_LEAST_5_2
+	depends on !(BR2_microblazeel || BR2_microblazebe) || \
+		BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_18
+	depends on !BR2_nds32 || BR2_TOOLCHAIN_HEADERS_AT_LEAST_5_2
+	depends on !BR2_nios2 || BR2_TOOLCHAIN_HEADERS_AT_LEAST_5_2
+	depends on !BR2_or1k || BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_7
+	depends on !BR2_sh || BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_7
+	depends on !BR2_xtensa || BR2_TOOLCHAIN_HEADERS_AT_LEAST_5_0
+
+endif

package/dhcpcd/dhcpcd.mk

@@ -17,23 +17,9 @@ DHCPCD_CONFIG_OPTS = \
 	--os=linux \
 	--privsepuser=dhcpcd
 
-# AUDIT_ARCH_{OPENRISC,SH,SHEL,SH64,SHEL64} are only available with kernel >= 3.7
-ifeq ($(BR2_or1k)$(BR2_sh):$(BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_7),y:)
-DHCPCD_CONFIG_OPTS += --disable-privsep
-endif
-
-# AUDIT_ARCH_MICROBLAZE is only available with kernel >= 3.18
-ifeq ($(BR2_microblazeel)$(BR2_microblazebe):$(BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_18),y:)
-DHCPCD_CONFIG_OPTS += --disable-privsep
-endif
-
-# AUDIT_ARCH_XTENSA is only available with kernel >= 5.0
-ifeq ($(BR2_xtensa):$(BR2_TOOLCHAIN_HEADERS_AT_LEAST_5_0),y:)
-DHCPCD_CONFIG_OPTS += --disable-privsep
-endif
-
-# AUDIT_ARCH_{ARCOMPACT,ARCV2,NDS32,NIOS2} are only available with kernel >= 5.2
-ifeq ($(BR2_arceb)$(BR2_arcle)$(BR2_nds32)$(BR2_nios2):$(BR2_TOOLCHAIN_HEADERS_AT_LEAST_5_2),y:)
+ifeq ($(BR2_PACKAGE_DHCPCD_ENABLE_PRIVSEP),y)
+DHCPCD_CONFIG_OPTS += --enable-privsep
+else
 DHCPCD_CONFIG_OPTS += --disable-privsep
 endif
 
@@ -49,7 +35,7 @@ DHCPCD_CONFIG_OPTS += --enable-static
 endif
 
 ifeq ($(BR2_USE_MMU),)
-DHCPCD_CONFIG_OPTS += --disable-fork --disable-privsep
+DHCPCD_CONFIG_OPTS += --disable-fork
 endif
 
 define DHCPCD_CONFIGURE_CMDS