package/libmodsecurity: needs dynamic library with libcurl and mbedtls

libmodsecurity embeds several mbedtls source files since version 3.0.0
and
https://github.com/SpiderLabs/ModSecurity/commit/a3ae686f2555bdacbfc9e1889ad05065711a165d
resulting in the following static build failure if curl is built with
mbedtls support:

/home/buildroot/autobuild/instance-0/output-1/host/opt/ext-toolchain/m68k-buildroot-uclinux-uclibc/bin/ld.real: /home/buildroot/autobuild/instance-0/output-1/host/bin/../m68k-buildroot-uclinux-uclibc/sysroot/usr/lib/libmbedcrypto.a(md5.c.o): in function `mbedtls_md5_free':
md5.c:(.text+0x16): multiple definition of `mbedtls_md5_free'; ../../src/.libs/libmodsecurity.a(libmbedtls_la-md5.o):md5.c:(.text+0x16): first defined here

Fixes:
 - http://autobuild.buildroot.org/results/98472a3a41cdbcb3d02289a437074a267f4b2e8e

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
(cherry picked from commit 9fc652a373034118535397fdd4042ab9f8fd7adf)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libmodsecurity/Config.in

@@ -2,6 +2,8 @@ config BR2_PACKAGE_LIBMODSECURITY
 	bool "libmodsecurity"
 	depends on BR2_INSTALL_LIBSTDCPP
 	depends on BR2_TOOLCHAIN_HAS_THREADS
+	# libmodsecurity embeds several mbedtls source files
+	depends on !(BR2_STATIC_LIBS && BR2_PACKAGE_LIBCURL_MBEDTLS)
 	select BR2_PACKAGE_PCRE
 	help
 	  Libmodsecurity is one component of the ModSecurity
@@ -17,3 +19,6 @@ config BR2_PACKAGE_LIBMODSECURITY
 
 comment "libmodsecurity needs a toolchain w/ C++, threads"
 	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS
+
+comment "libmodsecurity needs a toolchain w/ dynamic library"
+	depends on BR2_STATIC_LIBS && BR2_PACKAGE_LIBCURL_MBEDTLS

package/nginx-modsecurity/Config.in

@@ -3,6 +3,7 @@ config BR2_PACKAGE_NGINX_MODSECURITY
 	depends on BR2_PACKAGE_NGINX_HTTP
 	depends on BR2_INSTALL_LIBSTDCPP # libmodsecurity
 	depends on BR2_TOOLCHAIN_HAS_THREADS # libmodsecurity
+	depends on !(BR2_STATIC_LIBS && BR2_PACKAGE_LIBCURL_MBEDTLS) # libmodsecurity
 	select BR2_PACKAGE_LIBMODSECURITY
 	help
 	  The ModSecurity-nginx connector is the connection
@@ -14,3 +15,7 @@ config BR2_PACKAGE_NGINX_MODSECURITY
 comment "nginx-modsecurity needs a toolchain w/ C++, threads"
 	depends on BR2_PACKAGE_NGINX_HTTP
 	depends on !BR2_INSTALL_LIBSTDCPP || !BR2_TOOLCHAIN_HAS_THREADS
+
+comment "nginx-modsecurity needs a toolchain w/ dynamic library"
+	depends on BR2_PACKAGE_NGINX_HTTP
+	depends on BR2_STATIC_LIBS && BR2_PACKAGE_LIBCURL_MBEDTLS