mbedutils: enable MBEDTLS_THREADING_C and MBEDTLS_THREADING_PTHREAD

fixes #795.

srcpkgs/mbedtls/template

@@ -1,10 +1,10 @@
 # Template file for 'mbedtls'
 pkgname=mbedtls
 version=2.2.0
-revision=1
+revision=2
 hostmakedepends="perl cmake"
 build_style=cmake
-configure_args="-DENABLE_TESTING=0 -DUSE_SHARED_MBEDTLS_LIBRARY=1 -DLINK_WITH_PTHREAD=1"
+configure_args="-DENABLE_TESTING=0 -DUSE_SHARED_MBEDTLS_LIBRARY=1"
 short_desc="Portable cryptographic TLS library"
 maintainer="Juan RP <xtraeme@voidlinux.eu>"
 license="Apache-2.0"
@@ -12,6 +12,12 @@ homepage="https://tls.mbed.org/"
 distfiles="https://tls.mbed.org/download/mbedtls-${version}-apache.tgz"
 checksum=3c6d3487ab056da94450cf907afc84f026aff7880182baffe137c98e3d00fb55
 
+pre_configure() {
+	sed -i include/mbedtls/config.h \
+		-e 's/.*\(#define MBEDTLS_THREADING_C\)/\1/' \
+		-e 's/.*\(#define MBEDTLS_THREADING_PTHREAD\)/\1/'
+}
+
 mbedtls-devel_package() {
 	short_desc+=" - development files"
 	depends="${sourcepkg}-${version}_${revision}"