With GLES, a precision specifier is mandatory for float types.
Specifying one in the user shader is not enough because it happens too
late after uvec2 and uvec4 uses in the custom prefix.
When two shared objects are symlinked and if one is loaded,
CheckLoadedLibraries detects the other one as loaded too and run hooks a
second time.
Prevent this as it leads to recursive blocking calls in libEGL.
Le Philousophe