fix(gcc_version build): gcc_version is always empty

[Linmengoy]

shell:gcc -v 2>&1 | tail -1 | awk ' { print $3 } '
output: x.x.x
GCC_VERSION := $(word 3, $(GCC_VERSION))
GCC_VERSION is always '' ,then it always goes to the else

[dimiden]

@Linmengoy
On Ubuntu 20.04, the last line of gcc -v is gcc version 9.4.0 (Ubuntu 9.4.0-1ubuntu1~20.04.2), so that line is essential.
What environment did you test on? How does the gcc -v output appear in that environment?

[dimiden]

This modification breaks the retrieval of the GCC_VERSION value on Ubuntu.