test/math: fix for disabled long double math

Commit "test: cater for config" http://git.uclibc.org/uClibc/commit/test/math/Makefile.in?id=7598eeaa1defa2884adaa890bb115c493d69cc35 inverted check from
	ifeq ($(UCLIBC_HAS_LONG_DOUBLE_MATH),y)
to
	ifeq ($(UCLIBC_HAS_LONG_DOUBLE_MATH),)
with first branch indeed inverted - instead of adding tests they were excluded.
But "else" branch was not moved up (remember check was inverted).

This causes compile breakage when building basic-test.c:
--->---
TEST_LINK math/ basic-test
basic-test.c: In function 'ldouble_test':
basic-test.c:111:1: warning: implicit declaration of function 'nanl' [-Wimplicit-function-declaration]
 TEST_FUNC (ldouble_test, long double, nanl, LDBL_EPSILON, HUGE_VALL)
 ^
basic-test.o: In function `main':
basic-test.c:(.text.startup+0x834): undefined reference to `nanl'
basic-test.c:(.text.startup+0x858): undefined reference to `nanl'
basic-test.c:(.text.startup+0x880): undefined reference to `nanl'
basic-test.c:(.text.startup+0x8a8): undefined reference to `nanl'
basic-test.c:(.text.startup+0x8d4): undefined reference to `nanl'
basic-test.o:basic-test.c:(.text.startup+0x8e0): more undefined references to `nanl' follow
collect2: error: ld returned 1 exit status
make[3]: *** [basic-test] Error 1
--->---

Fix is simple - merge "old else" branch with the first current one.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Anton Kolesov <akolesov@synopsys.com>
Cc: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Cc: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

test/math/Makefile.in

@@ -8,7 +8,6 @@ TESTS_DISABLED := libm-test
 TESTS_DISABLED += gamma
 ifeq ($(UCLIBC_HAS_LONG_DOUBLE_MATH),)
 TESTS_DISABLED += test-ldouble test-ildoubl compile_test c99_test
-else
 CFLAGS_basic-test := -DNO_LONG_DOUBLE
 endif
 ifeq ($(DO_C99_MATH),)