Fix the include directory in the pkgconfig of the math lib (#4414)
Fix the include directory in the pkgconfig of the math lib (#4414)

The pkgconfig specified `include/jerry-math` as the include
directory, but cmake installs header to `include/jerryscript-math`.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu
robertsipka/jerryscript,zherczeg/jerryscript,bzsolt/jerryscript,robertsipka/jerryscript,dbatyai/jerryscript,bzsolt/jerryscript,robertsipka/jerryscript,akosthekiss/jerryscript,bzsolt/jerryscript,zherczeg/jerryscript,akosthekiss/jerryscript,robertsipka/jerryscript,akosthekiss/jerryscript,akosthekiss/jerryscript,robertsipka/jerryscript,dbatyai/jerryscript,dbatyai/jerryscript,zherczeg/jerryscript,akosthekiss/jerryscript,jerryscript-project/jerryscript,bzsolt/jerryscript,jerryscript-project/jerryscript,dbatyai/jerryscript,jerryscript-project/jerryscript,zherczeg/jerryscript,bzsolt/jerryscript,dbatyai/jerryscript,jerryscript-project/jerryscript,jerryscript-project/jerryscript,zherczeg/jerryscript,robertsipka/jerryscript