Use explicit revision in xtensa-fsf-elf

So that the build does not depend on internet connectivity.

Signed-off-by: Alexey Neyman <stilor@att.net>

samples/xtensa-fsf-elf/crosstool.config

@@ -10,17 +10,17 @@ CT_TARGET_CFLAGS="-mlongcalls"
 CT_TARGET_VENDOR="fsf"
 CT_BINUTILS_SRC_DEVEL=y
 CT_BINUTILS_DEVEL_URL="https://github.com/espressif/binutils-gdb.git"
-CT_BINUTILS_DEVEL_BRANCH="esp32-2018r1_binutils-2_30"
+CT_BINUTILS_DEVEL_REVISION="0104f7d3"
 CT_BINUTILS_V_2_30=y
 CT_NEWLIB_SRC_DEVEL=y
 CT_NEWLIB_DEVEL_URL="https://github.com/espressif/newlib-esp32.git"
-CT_NEWLIB_DEVEL_BRANCH="esp32-2018r1_newlib-2_2_0"
+CT_NEWLIB_DEVEL_REVISION="fdbb7b81"
 CT_LIBC_NEWLIB_TARGET_CFLAGS="-DSIGNAL_PROVIDED -DABORT_PROVIDED -DMALLOC_PROVIDED"
 CT_LIBC_NEWLIB_DISABLE_SUPPLIED_SYSCALLS=y
 CT_GCC_SRC_DEVEL=y
 CT_GCC_DEVEL_VCS_git=y
 CT_GCC_DEVEL_URL="https://github.com/espressif/gcc.git"
-CT_GCC_DEVEL_BRANCH="esp32-2018r1_gcc-8_2_0"
+CT_GCC_DEVEL_REVISION="bae67e9e"
 CT_CC_GCC_ENABLE_CXX_FLAGS="-fno-rtti -ffunction-sections"
 CT_CC_GCC_CORE_EXTRA_CONFIG_ARRAY="--enable-threads=posix"
 CT_CC_GCC_EXTRA_CONFIG_ARRAY="--disable-libstdcxx-verbose --enable-threads=posix --enable-gcov-custom-rtio"
@@ -31,7 +31,7 @@ CT_CC_LANG_CXX=y
 CT_DEBUG_GDB=y
 CT_GDB_SRC_DEVEL=y
 CT_GDB_DEVEL_URL="https://github.com/espressif/binutils-gdb.git"
-CT_GDB_DEVEL_BRANCH="esp32-2018r1_gdb-8_1"
+CT_GDB_DEVEL_REVISION="a9ff2591"
 CT_GDB_V_8_1=y
 CT_ISL_V_0_19=y
 CT_COMP_TOOLS_AUTOCONF=y