Add experimental support to Objective-C

Signed-off-by: Rodrigo Peixoto <rodrigopex@gmail.com>

Author: rodrigopex

configs/common.config

@@ -19,6 +19,8 @@ CT_GCC_CUSTOM_LOCATION="${GITHUB_WORKSPACE}/gcc"
 CT_CC_GCC_EXTRA_CONFIG_ARRAY="--with-gnu-ld --with-gnu-as --enable-initfini-array"
 CT_CC_GCC_CORE_EXTRA_CONFIG_ARRAY="--with-gnu-ld --with-gnu-as --enable-initfini-array"
 CT_CC_LANG_CXX=y
+## Experimental Objective-C support
+CT_CC_LANG_OBJC=y
 CT_MULTILIB_SPACE=y
 
 # Picolibc