alsa-lib: Lift the limitation to use gcc only cross compiler

alsa-lib configure tries to see that if CC variabled doesnt contain
'gcc' then it tries to guess and redefine CC to be something gcc, which
doesnt work with OE since we define CC to have sysroot and options
attached to it. So all tests fail when configure constructs the CC for
cross compiler like this. This portion is not needed at all

(From OE-Core rev: 33a7eb64cded61601c6ad6883e4d64ebe9ff547c)

(From OE-Core rev: 47212cb032b67dc59277f6c38e9aeda5a9b628a4)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-multimedia/alsa/alsa-lib/0001-build-Do-not-try-to-detect-cross-compiler.patch

@@ -0,0 +1,45 @@
+From 17aeb3565f411e7796cabe403f92d15948a8ca95 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Fri, 21 Aug 2015 14:42:45 -0700
+Subject: [PATCH] build: Do not try to detect cross-compiler
+
+cross compilers are passed via path may not be a gcc based cross
+compiler in such cases this check fails and try's to force gcc based
+cross compiler detection, This code is a convenience that limits the
+build system
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+Upstream-Status: Pending
+
+ configure.ac | 14 --------------
+ 1 file changed, 14 deletions(-)
+
+diff --git a/configure.ac b/configure.ac
+index 3022cf8..9d77440 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -27,20 +27,6 @@ AC_PREFIX_DEFAULT(/usr)
+ 
+ dnl Checks for programs.
+ 
+-dnl try to gues cross-compiler if not set
+-if test "x$host" != "x$build" -a -z "`echo $CC | grep -e '-gcc'`";
+-then
+-  AC_MSG_CHECKING(for cross-compiler)
+-
+-  which ${program_prefix}gcc >/dev/null 2>&1 && CC=${program_prefix}gcc
+-  which ${host_cpu}-${host_os}-gcc >/dev/null 2>&1 \
+-  && CC=${host_cpu}-${host_os}-gcc
+-  which ${host_cpu}-${host_vendor}-${host_os}-gcc >/dev/null 2>&1 \
+-  && CC=${host_cpu}-${host_vendor}-${host_os}-gcc
+-
+-  AC_MSG_RESULT($CC)
+-fi
+-	    
+ CFLAGS="$CFLAGS -D_GNU_SOURCE"
+ 
+ 
+-- 
+2.1.4
+

meta/recipes-multimedia/alsa/alsa-lib_1.0.29.bb

@@ -16,6 +16,7 @@ ARM_INSTRUCTION_SET = "arm"
 
 SRC_URI = "ftp://ftp.alsa-project.org/pub/lib/${BP}.tar.bz2 \
            file://Check-if-wordexp-function-is-supported.patch \
+           file://0001-build-Do-not-try-to-detect-cross-compiler.patch \
 "
 SRC_URI[md5sum] = "de67e0eca72474d6b1121037dafe1024"
 SRC_URI[sha256sum] = "73043c35eb9636be0f4af6a240235c213f12a25feb1f04aeeac8cb7e30fcbdd0"