gcc: remove older gcc version, c6x compiles fine with gcc6

target/config/Config.in.compiler

@@ -19,12 +19,12 @@ depends on ADK_BUILD_COMPILER_GCC
 default ADK_TOOLCHAIN_GCC_ARC if ADK_TARGET_ARCH_ARC
 default ADK_TOOLCHAIN_GCC_4_2_4 if ADK_TARGET_ARCH_METAG
 default ADK_TOOLCHAIN_GCC_4_4_7 if ADK_TARGET_ARCH_AVR32
-default ADK_TOOLCHAIN_GCC_4_8_5 if ADK_TARGET_ARCH_C6X
 default ADK_TOOLCHAIN_GCC_4_9_3 if ADK_TARGET_LIB_GLIBC && ADK_TARGET_ARCH_SH
 default ADK_TOOLCHAIN_GCC_4_9_3 if ADK_TARGET_SYSTEM_KINETIS_K70
 default ADK_TOOLCHAIN_GCC_5_3_OR1K if ADK_TARGET_ARCH_OR1K
 default ADK_TOOLCHAIN_GCC_6_1_0 if ADK_TARGET_ARCH_XTENSA
 default ADK_TOOLCHAIN_GCC_6_1_0 if ADK_TARGET_ARCH_BFIN
+default ADK_TOOLCHAIN_GCC_6_1_0 if ADK_TARGET_ARCH_C6X
 default ADK_TOOLCHAIN_GCC_5_3_0
 
 config ADK_TOOLCHAIN_GCC_GIT
@@ -68,18 +68,6 @@ config ADK_TOOLCHAIN_GCC_4_9_3
 	depends on !ADK_TARGET_ARCH_OR1K
 	depends on !ADK_TARGET_ARCH_TILE
 
-config ADK_TOOLCHAIN_GCC_4_8_5
-	bool "4.8.5"
-	depends on !ADK_TARGET_ARCH_BFIN
-	depends on !ADK_TARGET_ARCH_AARCH64
-	depends on !ADK_TARGET_ARCH_ARC
-	depends on !ADK_TARGET_ARCH_AVR32
-	depends on !ADK_TARGET_ARCH_CRIS
-	depends on !ADK_TARGET_ARCH_TILE
-	depends on !ADK_TARGET_ARCH_H8300
-	depends on !ADK_TARGET_ARCH_METAG
-	depends on !ADK_TARGET_ARCH_OR1K
-
 config ADK_TOOLCHAIN_GCC_5_3_OR1K
 	bool "5.3-or1k"
 	select ADK_DISABLE_HONOUR_CFLAGS
@@ -90,18 +78,6 @@ config ADK_TOOLCHAIN_GCC_ARC
 	depends on ADK_TARGET_ARCH_ARC
 	select ADK_DISABLE_HONOUR_CFLAGS
 
-config ADK_TOOLCHAIN_GCC_4_7_4
-	bool "4.7.4"
-	depends on !ADK_TARGET_ARCH_BFIN
-	depends on !ADK_TARGET_ARCH_AARCH64
-	depends on !ADK_TARGET_ARCH_ARC
-	depends on !ADK_TARGET_ARCH_AVR32
-	depends on !ADK_TARGET_ARCH_CRIS
-	depends on !ADK_TARGET_ARCH_TILE
-	depends on !ADK_TARGET_ARCH_H8300
-	depends on !ADK_TARGET_ARCH_METAG
-	depends on !ADK_TARGET_ARCH_OR1K
-
 config ADK_TOOLCHAIN_GCC_4_4_7
 	bool "4.4.7"
 	depends on ADK_TARGET_ARCH_AVR32