buildroot

Fix musl build

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musl does not define __GNUC_PREREQ. Use patch from Alpine Linux

(http://git.alpinelinux.org/cgit/aports/plain/main/celt051/fix-gnuc-prereq.patch).

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Fixes http://autobuild.buildroot.net/results/223/223ba6003bdd7e0c896455c21fa8fee943b4e716/

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Signed-off-by: Jörg Krause <joerg.krause@embedded.rocks>

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--- celt-0.5.1.3.orig/libcelt/ecintrin.h

+++ celt-0.5.1.3/libcelt/ecintrin.h

@@ -52,8 +52,7 @@

 /*Count leading zeros.

   This macro should only be used for implementing ec_ilog(), if it is defined.

   All other code should use EC_ILOG() instead.*/

-#ifdef __GNUC_PREREQ

-#if __GNUC_PREREQ(3,4)

+#if defined(__GNUC__) && ((__GNUC__<<16)+__GNUC_MINOR__) >= 0x304

 # if INT_MAX>=2147483647

 #  define EC_CLZ0 sizeof(unsigned)*CHAR_BIT

 #  define EC_CLZ(_x) (__builtin_clz(_x))

@@ -61,7 +60,6 @@

 #  define EC_CLZ0 sizeof(unsigned long)*CHAR_BIT

 #  define EC_CLZ(_x) (__builtin_clzl(_x))

 # endif

-#endif

 #endif

​

 #if defined(EC_CLZ)