Skip tests requiring extended precision if not avail

Alpine is running with Musl libc and musl uses extended precision
doubles, while valgrind can't handle extended precision,
2.3 == atof("2.3") won't be true under valgrind.

And therefore the option retrieval methods *_get_double would fail.

Also we have to increase the test verbosity, as `SKIPm` doesn't print
the message when skipping the tests.
See: silentbicycle/greatest#85

Makefile

@@ -71,7 +71,7 @@ dunstify: dunstify.o
 
 .PHONY: test test-valgrind test-coverage
 test: test/test clean-coverage-run
-	./test/test
+	./test/test -v
 
 test-valgrind: test/test
 	valgrind \
@@ -81,7 +81,7 @@ test-valgrind: test/test
 		--errors-for-leak-kinds=definite \
 		--num-callers=40 \
 		--error-exitcode=123 \
-		./test/test
+		./test/test -v
 
 test-coverage: CFLAGS += -fprofile-arcs -ftest-coverage -O0
 test-coverage: test

test/option_parser.c

@@ -97,6 +97,10 @@ TEST test_ini_get_int(void)
 
 TEST test_ini_get_double(void)
 {
+        if (2.3 != atof("2.3")) {
+                SKIPm("Skipping test_ini_get_double, as it seems we're running under musl+valgrind!");
+        }
+
         char *double_section = "double";
         ASSERT_EQ(1, ini_get_double(double_section, "simple", 0));
         ASSERT_EQ(1.5, ini_get_double(double_section, "decimal", 0));
@@ -152,6 +156,10 @@ TEST test_cmdline_get_int(void)
 
 TEST test_cmdline_get_double(void)
 {
+        if (2.3 != atof("2.3")) {
+                SKIPm("Skipping test_cmdline_get_double, as it seems we're running under musl+valgrind!");
+        }
+
         ASSERT_EQ(2, cmdline_get_double("-simple_double", 0, ""));
         ASSERT_EQ(5.2, cmdline_get_double("-double", 0, ""));
         ASSERT_EQ(3.14, cmdline_get_double("-nonexistent", 3.14, ""));
@@ -258,6 +266,10 @@ TEST test_option_get_int(void)
 
 TEST test_option_get_double(void)
 {
+        if (2.3 != atof("2.3")) {
+                SKIPm("Skipping test_option_get_double, as it seems we're running under musl+valgrind!");
+        }
+
         char *double_section = "double";
         ASSERT_EQ(2, option_get_double(double_section, "simple", "-simple_double", 0, ""));
         ASSERT_EQ(5.2, option_get_double(double_section, "simple", "-double", 0, ""));