Move big-int unit test to unit/ folder and make it a CATCH-style test

Author: tautschnig

src/big-int/CMakeLists.txt

@@ -1,6 +1,5 @@
 set(SRC bigint-func.cc bigint.cc)
 
-add_executable(test-bigint ${SRC} bigint-test.cc)
 add_library(big-int ${SRC})
 
 generic_includes(big-int)

src/big-int/bigint-test.cc

@@ -2,14 +2,9 @@ include ../config.inc
 include ../common
 
 SRC = bigint-func.cc bigint.cc
-PRG = test-bigint$(EXEEXT)
-CLEANFILES = $(PRG) big-int$(LIBEXT) bigint-test$(OBJEXT) bigint-test.d
+CLEANFILES = big-int$(LIBEXT)
 
-all : $(PRG) big-int$(LIBEXT)
+all: big-int$(LIBEXT)
 
 big-int$(LIBEXT): $(OBJ)
 	$(LINKLIB)
-
-$(PRG): $(OBJ) bigint-test$(OBJEXT)
-	$(LINKBIN)
-