sci-biology/tree-puzzle: fix configure checks for modern c

Signed-off-by: Sam James <sam@gentoo.org>

sci-biology/tree-puzzle/files/tree-puzzle-5.2-configure-c99.patch

@@ -0,0 +1,20 @@
+--- a/configure.ac
++++ b/configure.ac
+@@ -33,7 +33,7 @@ int main (int argc, char **argv)
+ {
+ MPI_Init(&argc,&argv);
+ MPI_Finalize();
+-exit(0);
++return 0;
+ }
+ EOF
+ 
+@@ -105,7 +105,7 @@ cat > conftest.c <<EOF
+ int main (int argc, char **argv)
+ {
+ printf ("%s-%s", PACKAGE, VERSION);
+-exit(0);
++return 0;
+ }
+ EOF
+ 

sci-biology/tree-puzzle/tree-puzzle-5.2-r1.ebuild

@@ -21,6 +21,7 @@ RDEPEND="${DEPEND}"
 PATCHES=(
 	"${FILESDIR}"/${P}-C99-decls.patch
 	"${FILESDIR}"/${P}-MPI-3.0.patch
+	"${FILESDIR}"/${P}-configure-c99.patch
 )
 
 src_prepare() {