math/cln: unbreak on armv7

This patch fixes the build for math/cln on armv7 by patching some wrong declarations.

It also hooks up the test suite to "make test".

PR:		259854
Approved by:	wen (maintainer timeout)

math/cln/Makefile

@@ -18,6 +18,7 @@ LIB_DEPENDS=	libgmp.so:math/gmp
 GNU_CONFIGURE=	yes
 CONFIGURE_ARGS=	--with-gmp=${LOCALBASE}
 INSTALL_TARGET=	install-strip
+TEST_TARGET=	check
 USES=		compiler:c11 gmake libtool pathfix pkgconfig tar:bzip2
 USE_LDCONFIG=	yes
 

math/cln/files/patch-src_base_low_cl__low__div.cc

@@ -1,5 +1,33 @@
 --- src/base/low/cl_low_div.cc.orig	2011-04-08 21:07:28 UTC
 +++ src/base/low/cl_low_div.cc
+@@ -10,11 +10,11 @@
+ // Implementation.
+
+ #ifdef NEED_VAR_divu_16_rest
+-uint16 divu_16_rest;
++extern "C" uint16 divu_16_rest;
+ #endif
+
+ #ifdef NEED_FUNCTION_divu_3216_1616_
+-uint16 divu_16_rest;
++extern "C" uint16 divu_16_rest = 0;
+ namespace cln {
+ #if 1
+ // Most processors have a good 32 by 32 bit division, use that.
+@@ -101,11 +101,11 @@ uint32 divu_3232_3232_(uint32 x, uint32 y)
+ #endif
+
+ #ifdef NEED_VAR_divu_32_rest
+-uint32 divu_32_rest;
++extern "C" uint32 divu_32_rest;
+ #endif
+
+ #ifdef NEED_FUNCTION_divu_6432_3232_
+-uint32 divu_32_rest;
++extern "C" uint32 divu_32_rest = 0;
+ namespace cln {
+ uint32 divu_6432_3232_(uint32 xhi, uint32 xlo, uint32 y)
+ // Methode:
 @@ -207,7 +207,7 @@ uint32 divu_6432_3232_(uint32 xhi, uint32 xlo, uint32 
  #endif
 

math/cln/files/patch-src_base_low_cl__low__mul.cc

@@ -1,5 +1,19 @@
 --- src/base/low/cl_low_mul.cc.orig	2011-04-08 21:06:30 UTC
 +++ src/base/low/cl_low_mul.cc
+@@ -10,11 +10,11 @@
+ // Implementation.
+
+ #ifdef NEED_VAR_mulu32_high
+-uint32 mulu32_high;
++extern "C" uint32 mulu32_high;
+ #endif
+
+ #ifdef NEED_FUNCTION_mulu32_
+-uint32 mulu32_high;
++extern "C" uint32 mulu32_high = 0;
+ namespace cln {
+ uint32 mulu32_ (uint32 x, uint32 y)
+ {
 @@ -50,11 +50,11 @@ uint64 mulu32_w (uint32 arg1, uint32 arg2)