Rename BUILDROOT_LIBC to BR_LIBC

No functional change, but internal variables should be name BR_foo, not
BUILDROOT_foo (I think ..).

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gcc/gcc-final/gcc-final.mk

@@ -10,7 +10,7 @@ GCC_FINAL_SOURCE  = $(GCC_SOURCE)
 
 HOST_GCC_FINAL_DEPENDENCIES = \
 	$(HOST_GCC_COMMON_DEPENDENCIES) \
-	$(BUILDROOT_LIBC)
+	$(BR_LIBC)
 
 HOST_GCC_FINAL_EXTRACT_CMDS = $(HOST_GCC_EXTRACT_CMDS)
 

package/gcc/gcc-intermediate/gcc-intermediate.mk

@@ -10,7 +10,7 @@ GCC_INTERMEDIATE_SOURCE  = $(GCC_SOURCE)
 
 HOST_GCC_INTERMEDIATE_DEPENDENCIES = \
 	$(HOST_GCC_COMMON_DEPENDENCIES) \
-	$(BUILDROOT_LIBC)-configure
+	$(BR_LIBC)-configure
 
 HOST_GCC_INTERMEDIATE_EXTRACT_CMDS = $(HOST_GCC_EXTRACT_CMDS)
 

toolchain/toolchain-buildroot/toolchain-buildroot.mk

@@ -6,7 +6,7 @@
 
 TOOLCHAIN_BUILDROOT_SOURCE =
 
-BUILDROOT_LIBC = $(call qstrip,$(BR2_TOOLCHAIN_BUILDROOT_LIBC))
+BR_LIBC = $(call qstrip,$(BR2_TOOLCHAIN_BUILDROOT_LIBC))
 
 # Triggering the build of the host-gcc-final will automatically do the
 # build of binutils, uClibc, kernel headers and all the intermediate