erlang: move if statement to pre_configure, rebuild with our CFLAGS.

srcpkgs/erlang/template

@@ -1,7 +1,7 @@
 # Template file for 'erlang'
 pkgname=erlang
 version=17.4
-revision=1
+revision=2
 wrksrc=otp_src_${version}
 build_style=gnu-configure
 configure_args="--enable-smp-support"
@@ -19,15 +19,15 @@ checksum="0d82eda6ae7ac6f0f860093324e540fa514497068ec3b4177800284e8c761f56
 
 build_options="x11"
 
-if [ "$CROSS_BUILD" ]; then
 pre_configure() {
+	if [ "$CROSS_BUILD" ]; then
 		# Build the bootstrap compiler for the host platform.
 		env - PATH=/usr/bin:/usr/sbin ./configure --enable-bootstrap-only
 		env - PATH=/usr/bin:/usr/sbin HOME=$HOME make ${makejobs}
 		configure_args+=" --build=$(erts/autoconf/config.guess)"
 		export erl_xcomp_sysroot=/usr/${XBPS_CROSS_TRIPLET}
-}
 	fi
+}
 
 post_install() {
 	vmkdir usr/share/man