add a shell script to check required glibc versions (#40)

update copyright years (#39)

Merge pull request #38 from matyalatte/version_inc

update documents

move build.bat and build.sh to ./scripts

remove RTTI from Linux/macOS builds (#37)

add a polyglot script: build.cmd (#36)

remove symbols from Linux/macOS binaries (#35)

Simplify cmake files (#34)

support MinGW-w64 builds (#33)

add EXR support (#32)

set osx deployment target for libjpeg

add tests for JPEG and PNG utilities (#31)

build all packages from build.bat and build.sh (#30)

support universal binary with jpg and png support (#29)