Fixed blockinfo for eac rg formats (#100)

See format info here:
https://docs.gl/es3/glCompressedTexImage2D

src/image.cpp

@@ -38,8 +38,8 @@ namespace bimg
 		{   4,  4, 4,  8, 1, 1,  0, 0,  0,  0,  0,  0, uint8_t(bx::EncodingType::Unorm) }, // ETC2A1
 		{   4,  4, 4,  8, 1, 1,  0, 0,  0,  0,  0,  0, uint8_t(bx::EncodingType::Unorm) }, // EACR11 UNORM
 		{   4,  4, 4,  8, 1, 1,  0, 0,  0,  0,  0,  0, uint8_t(bx::EncodingType::Snorm) }, // EACR11 SNORM
-		{   4,  4, 4,  8, 1, 1,  0, 0,  0,  0,  0,  0, uint8_t(bx::EncodingType::Unorm) }, // EACRG11 UNORM
-		{   4,  4, 4,  8, 1, 1,  0, 0,  0,  0,  0,  0, uint8_t(bx::EncodingType::Snorm) }, // EACRG11 SNORM
+		{   8,  4, 4, 16, 1, 1,  0, 0,  0,  0,  0,  0, uint8_t(bx::EncodingType::Unorm) }, // EACRG11 UNORM
+		{   8,  4, 4, 16, 1, 1,  0, 0,  0,  0,  0,  0, uint8_t(bx::EncodingType::Snorm) }, // EACRG11 SNORM
 		{   2,  8, 4,  8, 2, 2,  0, 0,  0,  0,  0,  0, uint8_t(bx::EncodingType::Unorm) }, // PTC12
 		{   4,  4, 4,  8, 2, 2,  0, 0,  0,  0,  0,  0, uint8_t(bx::EncodingType::Unorm) }, // PTC14
 		{   2,  8, 4,  8, 2, 2,  0, 0,  0,  0,  0,  0, uint8_t(bx::EncodingType::Unorm) }, // PTC12A