Consistently terminate libm-test-*.inc TEST lines with commas.

Some TEST_* lines in libm-test-*.inc end with semicolons not commas.
This works at present because gen-libm-test.pl ignores whatever comes
after the TEST_* call, but is logically wrong (since the TEST_* calls
generate array elements, not statements) and the Python replacement
for gen-libm-test.pl that I'm working on is stricter about the syntax
here.  This patch fixes the lines in question to use commas like most
such lines already do.

Tested for x86_64.

	* math/libm-test-ilogb.inc (ilogb_test_data): Use ',' not ';'
	after TEST_* calls.
	* math/libm-test-llogb.inc (llogb_test_data): Likewise.
	* math/libm-test-logb.inc (logb_test_data): Likewise.